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Table of Contents
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Step 4 - Removing the Einsy-base
Step 18 - Disconnecting the power cables
Step 24 - Removing the X-axis smooth rods
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Related Manuals for Original Prusa i3 MK3
Summary of Contents for Original Prusa i3 MK3
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Page 1: Table Of Contents
Table of Contents 1. Introduction ........................................Step 1 - Preparing the upgrade kit ................. Step 2 - Getting the necessary tools ..............Step 3 - Additional utilities for this guide ....................Step 4 - Labels guide ......................Step 5 - Spare bag ................ - Page 2 ..............Step 25 - X motor preparation (MK3.9S) ..............Step 26 - For new users of black PSU ..................Step 27 - Parts summary I..............Step 28 - Parts summary II. (MK3.9S) ..................Step 29 - Don't throw away ..............
- Page 3 ............Step 6 - Assembling the X-end-idler (part II) ............Step 7 - Assembling the X-end-idler (part III) ..........Step 8 - Mounting the bearings: parts preparation ............Step 9 - Inserting the bearings: bearing pads ............Step 10 - Inserting the bearings: bearing clips ............
- Page 4 ..............Step 26 - Wrapping the textile sleeve ....... Step 27 - Attaching the Ext-cable-holder: parts preparation ..............Step 28 - Wrapping the X motor cable ..............Step 29 - Attaching the Ext-cable-holder ............Step 30 - Assembling the Ext-cable-holder ..............
- Page 5 ................Step 45 - Testing the X-axis belt ....................Step 46 - Haribo time! ............... Step 47 - The extruder is assembled 6. xLCD assembly .................................... Step 1 - Tools necessary for this chapter ..........Step 2 - xLCD assembly: parts preparation (part 1) ..........
- Page 6 ........Step 6 - Covering the heatbed cables: parts preparation ........Step 7 - Assembling the heatbed-cable-cover-bottom ......Step 8 - Assembling the heatbed-cable-cover: nylon filament ........Step 9 - Assembling the heatbed-cable-cover-bottom ..........Step 10 - Assembling the heatbed-cable-cover-top .................
- Page 7 ............Step 61 - Filament guide assembly (part 1) ............Step 62 - Filament guide assembly (part 2) ....................Step 63 - Haribo time! ....................... Step 64 - That's it 8. Preflight check ......................................Step 1 - Attaching the print sheet ..................
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Page 9: Introduction
1. Introduction Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 10: Step 1 Preparing The Upgrade Kit
Prusa Research. STEP 2 Getting the necessary tools The package includes: Needle-nose pliers (1x) Philips (PH2) screwdriver (1x) Universal wrench (1x) Wrench size 13 mm (1x) Torx key set Allen key set Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 11: Step 3 Additional Utilities For This Guide
Print it at 100 %, don't rescale it, otherwise, it won't work. For PRUSA veterans: Fasteners are divided into individual bags according to its type. Not into packages for individual chapters, as it was with previous printers. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 12: Step 5 Spare Bag
STEP 6 Printed parts - versioning Most of the 3D printed parts on Original Prusa MK4 are marked with their version. E, F and Gx series (e.g. E1) - those parts are printed on Prusa Research farm and are distributed with the kit. -
Page 13: Step 7 Printable Parts - Silver To Black Psu
Lost in the instructions, missing screw or cracked printed part? Let us know! You can contact us using the following channels: Using comments under each step. Using our 24/7 live chat here at help.prusa3d.com Writing an email to info@prusa3d.com Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 14: Step 9 Pro Tip: Inserting The Nuts
When you browse the guide on help.prusa3d.com, you can view the original images in high resolution for clarity. Just hover your cursor over the image and click the Magnifier button ("View original") in the top left corner. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 15: Step 11 - Important: Electronics Protection
Be extra cautious in rooms with carpets, which are often a source of electrostatic energy. Clothes made of wool or certain synthetic fabrics can easily gather static electricity too. It is safer to wear cotton clothing for the assembly. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 16: Step 12 Reward Yourself
Please consult a professional in the closest candy store. Hide the Haribo for now! From our experience an unattended bag with sweets will suddenly disappear. Confirmed by multiple cases all around the World. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 17: Step 13 How To Successfully Finish The Assembly
Once the printer is fully functional, follow the separate MMU3 or Enclosure assembly manual to modify the printer for installation. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 18: Step 15 Prepare Your Desk
Prepare something to contain the plastic bags and the removed packing materials so you can recycle them afterwards. Make sure there are no important parts being discarded. OK, we are ready. Let's start! Go to chapter 1a. Parts check Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 19: 1A. Parts Check
1a. Parts check Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 20: Step 1 Introduction
Filament is unloaded from the extruder. Spool holder is removed from the printer. Flexible print sheet is removed from the heatbed. Printer is turned OFF and the power cable is unplugged from the PSU (power supply unit). Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 21: Step 3 Heatbed Inspection
Likewise, if the smooth rods are scratched or the bearing travel on the rods is not smooth (they really stutter), inspect your existing bearings. However, your upgrade kit includes brand-new bearings, so if your existing ones are in good condition, you can keep them as spares. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 22: Step 5 Y-Axis Smooth Rods Inspection
(bent, broken) with a new one. All parts are available in our eshop. Any scratches and scuffs are of no significance for the upgrade. In this case, it is up to your discretion to replace the parts. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 23: Step 7 Can I Open The Haribo
This dose of energy is primarily for printer assembly. Wait until you are prompted to open it. STEP 8 Let's get started Everything checked? So, let's start with disassembling the printer. Go to the next chapter 1b. Printer disassembly. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 24: 1B. Printer Disassembly
1b. Printer disassembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 25: Step 1 Tools Necessary For This Chapter
2.0 mm Allen key for heatbed screws 2.5mm Allen key for all M3 screws STEP 2 Opening the electronics box Loosen the screw on the Einsy-base. Open the Einsy-door to access the electronics. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 26: Step 3 Disconnecting Cables
From the opposite side of the Einsy-base, locate the screw behind the cooling fins and loosen it, no need to remove it. Grasp the Einsy-base and slide it out of the printer frame. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 27: Step 5 Removing The Einsy-Door
We recommend placing the heatbed temporarily on a piece of clean cloth or other soft pad. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 28: Step 7 Dismantling Cable Management
Carefully remove the LCD cables from the extrusion. Place the printer back on its feet. Release four M3 screws securing the LCD assembly in the front plate. Remove the LCD assembly from the printer. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 29: Step 9 Dismantling The Y-Axis: Removing The Belt
Release and remove two M3 screws securing each Y-rod-holder in the rear plate. Remove the entire Y-axis assembly from the printer. Do not remove any parts from the assembly at this time. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 30: Step 11 - Removing The Z-Axis-Tops
And two zip ties on the underside of the cable-holder. Some MK3 units may have a rubber spiral wrap instead of the textile sleeve. Loosen the M3 screw securing the cable-holder. Remove the cable-holder from the extruder. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 31: Step 13 Removing The X-Axis Assembly
Pull out both Z-axis smooth rods from the Z-bottoms. STEP 14 Removing the Z-axis motors Release four M3 screws from both Z-bottom securing the Z-axis motors. Remove the motors by pulling them out from underneath. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 32: Step 15 Removing The Z-Axis-Bottoms
The serial number label can be on the back of the rear plate or on the back of the printer above the PSU. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 33: Step 17 Y Motor Preparation (Mk3.9S)
Focus on the cables guiding from the PSU. Release two M3 screws inside the PSU-cover. Remove the PSU-cover from the PSU. Disconnect all power cables from the PSU. Disconnect the power panic cable from the PSU. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 34: Step 19 Disassembling The Y-Carriage: Belt
MK3 and MK3S use a zip tie instead of a screw. Cut off the zip tie and remove the Y-rod-holder from the rod. Do the same with all four Y-rod-holders. Remove the smooth rods from the Y-carriage assembly. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 35: Step 21 Disassembling The Y-Carriage: Bearings
Disassembling the X-axis: Removing the pulley Remove the M3 screw securing the pulley in the X-end-idler. Pull the pulley and the belt out of the X-end-idler. Put the pulley aside, you don't need it anymore. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 36: Step 23 Removing The X-Axis Motor
Pull out both smooth rods from the X-end-idler. It can be difficult to remove the parts and more force is required. Use extreme caution to avoid injury. Keep the smooth rods aside, you will need them for the upgrade. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 37: Step 25 X Motor Preparation (Mk3.9S)
If you've bought the black 24V 240W PSU, visit the dedicated installation guide here: How to replace the silver PSU with the black PSU. Don't forget to get back to this manual afterwards. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 38: Step 27 Parts Summary I
STEP 28 Parts summary II. (MK3.9S) In case you’re building a MK3.9S printer, you will also need: X motor (1x) Y motor (1x) Z motor left (1x) Z motor right (1x) Trapezoidal nut (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 39: Step 29 Don't Throw Away
Can I have a gummy bear yet? No gummy bears yet? Please hold We do not want to keep you waiting, but the correct dosage of gummy bears is very important for the whole procedure. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 40: 1C. Parts Preparation
1c. Parts preparation Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 41: Step 1 Tools Necessary For This Chapter
Remove the cover. Release the screws fixing the heatbed power cables and remove the cables from the heatbed. From the underside, grasp the M3nN nuts with the pliers while loosing the screws. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 42: Step 3 Removing The Heatbed Thermistor
Pay attention to the instructions! The "yellow" Kapton tape tends to curl up and you won't be able to restore its initial shape!! All the necessary parts can be found in the Heatbed thermistor set bag. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 43: Step 5 Preparing The Heatbed And Thermistor
Peel or bend the tape slightly, to reveal the tip of the thermistor. STEP 6 Covering the thermistor Maintain the thermistor position and cover it with aluminum tape. Ensure that the whole thermistor sensor is covered with the tape. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 44: Step 7 Fixing The Thermistor In Place
In case you’re building the MK3.9S printer, please prepare: Motor cable adapter (4x) X motor (1x) you removed earlier Y motor (1x) you removed earlier Z left motor (1x) you removed earlier Z right motor (1x) you removed earlier Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 45: Step 9 Motors Adaptation (Mk3.9S)
Install the cable adapter onto the X motor cable. Install the cable adapters onto both the Z motor cables. STEP 10 M3nEs nuts: parts preparation For the following steps, please prepare: M3nEs nut (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 46: Step 11 Inserting The M3Nes Nuts
Use this method for both M3nEs nuts. The exact position of the nuts doesn't matter at this time. STEP 12 Cable clips: parts preparation For the following steps, please prepare: Cable clip (6x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 47: Step 13 Installing The Cable Clips
Installing the cable clips Install three clips to the long extrusion. Install one clip to the short extrusion close to the frame. See the picture. Turn the frame, install two clips to the second short extrusion. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 48: Step 15 Stickers And Labels: Parts Preparation
Peel off the protective layer from the rear side of the label. Glue the label on the left side of the rear plate. Make sure, the surface is clean. Use the supplied cleaning pad. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 49: Step 17 Parts Summary
Z right motor (1x) adapted to the new connector From this point, the assembly process is the same for both MK3.9S and MK4S. Note that some images may show the MK4S logo instead of MK3.9S. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 50: Step 20 Still No Sweets
Keep them aside to avoid mixing with new parts. STEP 20 Still no sweets? Please don't open the bag yet. But you are getting close to your first taste ;). Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 51: Step 21 That's It
1c. Parts preparation STEP 21 That's it Once you have all of the parts listed, proceed with upgrading your printer. Let's go to the next chapter 2. Frame assembly. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 52: Frame Assembly
2. Frame assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 53: Step 1 Tools Necessary For This Chapter
Thermal pad 40x12x2.2 mm (1x) Thermal pad 12x12x2.2 mm (2x) M3x6 screw (9x) M3x10 screw (2x) The list continues in the next step... Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 54: Step 3 Mounting The Xbuddy Box: Parts Preparation
Insert two M3x10 screws into the M3nE nuts in the second short extrusion. Turn them only 3-4 times by using a 2.5mm Allen key, just for the screws to be kept in place. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 55: Step 5 Attaching The Xbuddy Box
Fully tighten all four M3x6 screws to secure the xBuddy box. Be careful when tightening the "rear" top screw. Use the shorter side of the Allen key for final tightening. Fully tighten both M3x10 screws in the M3nE nuts. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 56: Step 7 Applying The Thermal Pads
A few turns are enough for now. Put aside your instinct and leave the hole on the bottom right empty. Fully tighten all five screws. But very carefully, otherwise you can damage the electronics board. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 57: Step 9 Attaching The Zip Ties
Do not discard the X-holder. You will need it later again. Place the printer back on its "feet". STEP 10 Y-belt-idler: parts preparation For the following steps, please prepare: Y-belt-idler (1x) M3x10 screw (2x) M3nS nut (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 58: Step 11 - Assembling Y-Belt-Idler
Arrange the frame so that the longer extrusions are facing you. Attach the Y-belt-idler from "inside" to the front plate. Note the correct orientation of the part. Secure the Y-belt-idler with two M3x10 screws. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 59: Step 13 Assembling The Y Motor: Parts Preparation
Y motor (1x) Ensure you are using the correct motor, there is a label on the bottom of the casing. The reason is, each motor has different cable length. GT2-16 pulley (1x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 60: Step 15 Assembling The Y-Motor-Holder
And align the pulley with the Allen key. When the pulley is aligned, tighten the grub screw in the pulley against the flat part of the shaft. Then rotate the pulley and tighten the second grub screw. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 61: Step 17 Attaching The Y-Motor-Holder
Ensure the correct orientation. The pulley must be facing towards the PSU. Attach the Y-motor-holder by using two M3x10 screws. To keep the Y motor cable safe during the assembly, temporarily hide it in the extrusion on the xBuddy box side. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 62: Step 18 Haribo
Compare the final look of the assembly with the picture. So that was an easy start, wasn't it? Good job anyway! Now, let's play with the next chapter: 3. X-axis & X-carriage assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 63: X-Axis & X-Carriage Assembly
3. X-axis & X-carriage assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 64: Step 1 Tools Necessary For This Chapter
Permanent marker (not included in the kit) STEP 2 X-axis assembly: parts preparation For the following steps, please prepare: X-end-idler (1x) X-end-motor (1x) M3x25 screw (1x) M3x16 screw (4x) M3nS nut (7x) M3n nut (6x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 65: Step 3 Assembling The X-End-Motor (Part I)
From inside the oval opening, insert the M3nS nut into the X-end-motor. From the side, insert the second M3nS nut into the part. Do not put too much pressure on the nut to avoid damaging the opposite printed wall. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 66: Step 5 - Assembling The X-End-Idler (Part I)
There is no thread in the plastic part, no nut. The screw cuts a thread into the plastic when tightened. Insert and tighten the second M3x16 screw from the "top" side of the part. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 67: Step 7 Assembling The X-End-Idler (Part Iii)
LM10LUU linear bearing (2x) The bearings come pre-lubricated from our factory and do not require additional lubrication upon initial use. X-end-clip (2x) Rubber pad 20x10x1 mm (4x) M3x30 screw (6x) M3x18 screw (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 68: Step 9 Inserting The Bearings: Bearing Pads
Make sure the bearing pads are in place when inserting the bearing. Position the bearing like in the third picture. The ball rows must be oriented to "X" in the bearing clip. Repeat the same procedure for the second bearing clip. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 69: Step 11 - Covering The Bearings: X-End-Motor
There are two types of the screws for the X-end-clip on the X-end-idler: Insert two M3x30 screw into the holes on the left side. Insert two M3x18 screws into the holes on the right side. Tighten the screws completely, but diagonally. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 70: Step 13 Assembling The X-Axis: Parts Preparation
Use the same procedure for the remaining two bearings. We will use these markings in the upcoming chapters to achieve the desired bearing orientation. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 71: Step 15 Assembling The X-Axis: Inserting Smooth Rods
STEP 16 Assembling the X-axis: mounting the X-end-motor Carefully slide the X-end-motor fully onto both smooth rods. Through the inspection hole check if the smooth rods are in touch with the screw. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 72: Step 17 Assembling The X-Carriage: Parts Preparation
STEP 18 Assembling the X-carriage Locate the protrusions on the X-carriage part and insert three M3nS nuts into the square holes. From the "bottom" of the part, insert five M3nS nuts into the part. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 73: Step 19 Attaching The Spacers
From the "front" side of the X-carriage, attach two hex spacers on the protruding M3x10 screws in the same way described in the previous step. Tighten the screws. Note the cutout of the same shape as the spacer. It must fit perfectly and must not rotate. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 74: Step 21 Assembling The X-Carriage-Clip: Parts Preparation
For the following steps, please prepare: X-carriage-clip (1x) M3x10 screw (4x) Rubber pad 20x10x1 mm (2x) STEP 22 Assembling the X-carriage-clip Place two rubber pads into the rectangular pockets inside the X- carriage-clip. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 75: Step 23 Attaching The X-Carriage-Clip
X-carriage for now. Cover the bearings with the X-carriage-clip and secure it by four M3x10 screws. Notice the orientation of the part. Do not fully tighten the screws at the moment. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 76: Step 24 Attaching The X Motor: Parts Preparation
Make sure that the "tension" screw on the X motor side does not fall out during handling. Position the motor so that the screws are at the inner end of the oval holes. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 77: Step 26 Attaching The X Motor: Mounting The Pulley
Rotate the pulley and tighten the second grub screw. STEP 27 Guiding the X belt: parts preparation For the following steps, please prepare: X belt (1x) Pin H8 2.9x20 (1x) GT2-20 Idler pulley (1x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 78: Step 28 Guiding The X Belt: X-End-Idler
Allen key. Push the "lower" end of the belt through the belt channel in the X-carriage. Guide the belt through the X-end-motor around the pulley and back to the X- carriage. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 79: Step 30 Guiding The X Belt: X-Carriage
After you ensure that the movement is smooth, fully tighten the screws on the X- carriage-clip in this order: Upper left screw Lower right screw Upper right screw Lower left screw Move the X-carriage several times to both sides and check the movement is still smooth. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 80: Step 32 Haribo
"little rubber bears" in German. STEP 33 It's done! Compare your assembly with the picture. Everything is OK? Nice job, you just successfully assembled the X-axis assembly. Let's go the next chapter: 4. Z-axis assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 81: Z-Axis Assembly
4. Z-axis assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 82: Step 1 Tools Necessary For This Chapter
2.5mm Allen key Needle-nose pliers STEP 2 Assembling the Z-bottoms: parts preparation For the following steps, please prepare: Z-bottom left (1x) Z-bottom right (1x) M3x10 screw (6x) Smooth rod 10 x 325 mm (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 83: Step 3 Inserting The Rods
Then remove the screws and attach the printed part. Avoid wobbling with the rods in the Z-bottoms, this could cause them to break and fatally destroy the plastic parts, which could lead to injury. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 84: Step 6 Attaching The Rubber Pads
You will need them in a few steps. STEP 6 Attaching the rubber pads Place both rubber pads onto the motor surface. Make sure the holes in the pads are aligned with the holes in the motors. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 85: Step 7 Installing The Z Motors
Guide both the Z motor cables freely under the frame towards the xBuddy Box. Connect the cables to the third and fourth slots on top of the xBuddy Board. Motor cable labeled ZL connect into the left slot, ZR into the right. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 86: Step 9 Mounting The X-Axis Assembly: Parts Preparation
It is important to place the X-holder at the center of the frame and the X-axis. If not, the centering results could be inaccurate. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 87: Step 11 - Installing The X-Axis Assembly
There may be a small gap between the trapezoidal nut and the printed part. Tightening the two screws will cling the nut completely to the part. In the same way, install the second trapezoidal nut on the X-end-motor (left threaded rod). Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 88: Step 13 Installing The Z-Top Parts: Parts Preparation
Repeat this step on the other side of the frame with Z-top-right printed part. Rotate both threaded rods in parallel to move the X-axis assembly a few centimeters higher to release the X-holder. Remove the X-holder from the printer. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 89: Step 15 Loveboard: Parts Preparation
Take the end of the extruder main cable without the white label. From the back of the printer, guide the extruder main cable to the front of the printer through the gap between the belt and the upper rod. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... - Page 90 Very gently pull on the extruder main cable bundle to reduce the bundle on the connector side. There must be a minimal loop. Otherwise, the cable will interfere with other parts in the next chapter. The cables must not interfere with the extruder motor compartment. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade...
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Page 91: Step 17 - Connecting The Extruder Main Cable
Push the M3x40 screw through the X-carriage-cable-holder. Attach the X-carriage-cable-holder to the X-carriage underneath the extruder main cable and tighten the M3x40 screw. Do not pinch any wire of the extruder main cable! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 92: Step 21 Covering The X-Carriage: Parts Preparation
After the nylon filament holds in the X-carriage, check that it inclines upwards as seen in the picture. If it is pointing down instead, re-install the nylon filament into the X-carriage by the other bent end and check again. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 93: Step 23 Attaching The X-Cover-Back
The ends of the textile sleeves are heat-sealed at the factory to prevent ripping. To open them, the sealed end joints must be cut or torn. Zip tie (2x) X-carriage-cable-holder-cover (1x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 94: Step 26 Wrapping The Textile Sleeve
Wrap the textile sleeve around the extruder main cable and nylon filament. Proceed in a spiral motion around the bundle so that it is tightly bound together. Hold the cable bundle upwards while wrapping and continue until it is fully wrapped. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 95: Step 28 Wrapping The X Motor Cable
Textile sleeve 5x300 mm (1x) STEP 28 Wrapping the X motor cable Wrap the X motor cable to the textile sleeve. It's alright that the textile sleeve doesn't go over the full length of the motor cable. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 96: Step 29 Attaching The Ext-Cable-Holder
Take the X motor cable and guide it over the extruder main cable through the left channel in the Ext-cable-holder-a. Guiding the X motor cable behind the main cable could cause problems with axis travel when printing. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 97: Step 31 Covering The Ext-Cable-Holder
Leave the cables free in the xBuddy box for now. We will connect them later on. According to the third picture, compare the guiding of the extruder main cable. Note the curve of the cable guide. Compare the guiding of the X motor cable. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 98: Step 33 Reward Yourself
Here it is! Compare your build with the picture. Everything is right? Congratulations! You have successfully assembled the Z-axis with some other small things. So, let's continue with the next chapter: 5. Nextruder assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 99: Nextruder Assembly
5. Nextruder assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 100: Step 1 Tools Necessary For This Chapter
Needle-nose pliers STEP 2 Nextruder idler assembly: parts preparation For the following steps, please prepare: Idler-lever-a (1x) Idler-lever-b (1x) Bearing 693 2RS (2x) Pin 2.9x8.5 (2x) M3x6 screw (1x) Tubular spacer 13.2x3.8x0.35 (1x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 101: Step 3 Assembling The Extruder Idler
Both are functionally identical, so assembly remains the same. The latest version has several holes around the main gear. Heatsink assembly (1x) Main-plate (1x) PG-ring (1x) PG-assembly-adapter (1x) The list continues in the next step... Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 102: Step 5 - Assembling The Extruder: Parts Preparation
Place the main-plate on the heatsink. Note the orientation of the part. Use the cutout as a guide. Before proceeding to the next step, make sure that the 5x10x0.1 spacer is placed on the extruder motor. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 103: Step 7 Assembling The Gearbox
With the other hand, slide the PG-ring onto the PG assembly in a wobbling motion (move the PG-ring left and right repeatedly) - a quarter turn is enough. Stop when the surfaces of the gears are approximately flush with the surface of the PG ring. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 104: Step 9 Assembling The Pg-Assembly
PG-ring's surface or at the same level as the ring. Ensure that the gap between the PG-ring and the Main-plate is minimal. If a significant gap is observed, disassemble the planetary gear assembly and reposition it. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 105: Step 11 - Assembling The Nextruder Idler
STEP 12 Gear lubrication: parts preparation For the following steps, please prepare: PG-case (1x) M3x25 screw (3x) Lubricant (1x) included in Fasteners & ELE box Several paper towels to wipe grease from your hands. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 106: Step 13 Lubricating The Gear
Place the PG-case on the gearbox and secure it with three M3x25 screws. Do not tighten them completely at this moment. The screws on the PG-case will be completely tightened during the self-test in the final chapter. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 107: Step 15 Assembling The Idler-Swivel: Parts Preparation
Note: The kit includes a Y-carriage Fasteners package containing M3nN nuts and M3x12 screws. Keep this package for later—we will tell you when to open it. Until then, take the fasteners from the main FASTENERS bag. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 108: Step 16 Assembling The Idler-Swivel
Secure both parts together by inserting the M3x20rT screw from the same side, like the first screw. Secure the screw with M3nN nut. Do not overtighten the nut. It must be possible to move with the Idler-swivel on the Idler-nut. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 109: Step 18 Mounting The Idler-Swivel Assembly
STEP 19 NTC thermistor & fan holder: parts preparation For the following steps, please prepare: NTC thermistor 90 mm (1x) M3x12 screw (3x) M3x4T grub screw (1x) MK4S fan holder (1x) Heatsink spacer (1x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 110: Step 20 Assembling The Ntc Thermistor
Make sure the protrusion protrudes towards you (like the screws). From the extruder motor side of the heatsink, attach the MK4S fan holder to the heatsink. Avoid pinching the NTC thermistor cable. Guide it through the cutout as shown in the detail. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 111: Step 22 Attaching The Nextruder
Locate the cable channel on the left side of the X-carriage. We will guide some of the cables through this channel in the following steps Guide the NTC thermistor through the cable channel in the X-carriage up to the LoveBoard and connect it to the top right slot. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 112: Step 24 Assembling The Hotend Fan: Parts Preparation
- not visible. Guide the fan cable through the cutout in the fan holder. Guide the fan cable through the cable channel up and connect it to the lower slot on the LoveBoard. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 113: Step 26 Print Fan Blower: Parts Preparation
Double-check from the side that the inserted nut is aligned with the hole in the part. From the opposite side, insert two M3nS nuts all the way into the holes. Check that nuts are fully inserted. Insert one M3nS nut into the hole in the Fan-shroud. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 114: Step 28 Assembling The Print Fan Blower
First, insert those teeth into the rectangular cutouts. Close the Fa-shroud and secure it with the M3x5rT screw. Tighten the screw gently until it resists significantly. Do not overtighten; otherwise, it can crack the parts. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 115: Step 30 Mounting The Print Fan Blower Assembly
From the right side of the fan holder, secure both parts together using two M3x5rT screws. Guide the print fan blower cable through the cable channel in the X-carriage and plug the connector to the middle slot on the LoveBoard. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 116: Step 32 Inserting The Hotend Assembly: Parts Preparation
While pushing the hotend assembly in, firmly tighten both thumb screws. Avoid pinching any cable between the screws and the heatsink! From the underside, check that the hotend is oriented correctly. It must fit between the cutouts in the X-carriage. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 117: Step 34 Nozzle Insertion Check
Guide the hotend thermistor through the cable channel in the X-carriage and connect it to the LoveBoard. Guide the hotend heater through the cable channel in the X-carriage and connect it to the LoveBoard. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 118: Step 36 Fan Door Cover: Parts Preparation
Attach the Fan-door-cover hinge into its counterpart in the X-carriage. Holes in both parts must be aligned. Insert the M3x30 screw in the hinge on the fan-door. Fully tighten the screw, then loosen it by a quarter turn. The fan-door must move freely! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 119: Step 38 Connecting The Extruder Cables
Close the idler mechanism before proceeding to the next step if you haven't already done so. Use the following sequence: Close the extruder idler to the extruder Close the idler-swivel and lock it over the extruder idler assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 120: Step 40 Covering The Loveboard: Parts Preparation
Make sure the LoveBoard-cover-right fits snugly against the right side of the extruder. If not, it may cause the X-axis test to fail during the self-test because it will prevent the X-carriage assembly from moving all the way to the right. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 121: Step 42 Covering The Loveboard: Top Cover
For optimal performance, the belt must have some resistance when pressed with your fingers. Move the extruder to the X-end-idler and try the belt tension in the middle of the X-axis. When you achieve optimal tension, please tighten the screws again. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 122: Step 44 Belt Tension Check
If the belt is stretched properly, you should feel a resistance and the extruder won't move at all. If the belt is too loose, it will deform (create a "wave") and jump over the teeth on the pulley. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 123: Step 46 Haribo Time
But don't do that now. STEP 47 The extruder is assembled That was tough. But we made it! Let's go the next chapter: 6. xLCD assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 124: Xlcd Assembly
6. xLCD assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 125: Step 1 Tools Necessary For This Chapter
(part 1) For the following steps, please prepare: xLCD-support(1x) xLCDcover (1x) xLCD (1x) Remove the protective film from the xLCD screen. xReflector sticker set (1x) The list continues in the next step... Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 126: Step 3 Xlcd Assembly: Parts Preparation (Part 2)
"gutter" in the xLCD-cover. Continue to lay down the xReflector sticker strip towards the other side of the gutter. Press the xReflector sticker strip all the way into the gutter so it adheres to the xlcd- cover. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 127: Step 5 Covering The Xlcd
Center the PE Faston in the opening and secure it with the 3x8sT screw. The screw cuts thread directly into the plastic, so there might be some resistance. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 128: Step 7 Xlcd Cables: Parts Preparation
Make sure the xLCD cable is connected in the same orientation as seen in the picture. Otherwise, your display won't work Take the end of the PE cable with the square connector. Slide the connector onto the PE Faston all the way. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 129: Step 9 Attaching The Knob
If screws are hard to tighten, pre-screw them into the xLCD support to create a thread for easier tightening. Guide both cables through the cable clips inside the frame, leaving the end of the xLCD cable free for now. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 130: Step 11 Black Vs Silver Psu
STEP 12 Connecting the BLACK PSU: parts preparation For the following steps, please prepare: PSU-cover (1x) M3x10 screw (2x) xBuddy power cable (2x) Power panic cable (1x) Zip tie (4x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 131: Step 13 Connecting The Black Psu: Pe Cable
Secure the cable by re-using the screw together with the washer. Note the correct orientation of the PE cable connector. Guide the PE cable so that it does not interfere with the threaded column under the PE connector. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 132: Step 14 Power Cables Info
The red cable (positive) may have a black stripe on it. Similarly, the black cable (negative) can have a red stripe on it. Do not connect any cables yet, wait until you have prompted. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 133: Step 16 Connecting The Black Psu (Part 2)
The black (-) wires are connected into the two terminals on the right. Make sure that cables are tightened properly. Otherwise, there is a risk of a damage to the printer and its surroundings! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 134: Step 17 Connecting The Power Panic (Black Psu)
Start tightening the zip tie so it is snug and holds the wires on both sides. Be careful not to over-tighten the zip tie as it could damage the wires. Cut off the remaining part of the zip tie very carefully. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 135: Step 19 Guiding The Power Cable Bundle (Black Psu)
Guide the PE cable from the xLCD through the cutout in the frame and include it in the cable bundle. Secure the cable bundle with the zip tie. Guide all cables from the PSU through the cable-clip. Leave the ends of the cables free for now. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 136: Step 21 Connecting The X And Y Motor Cables (Black Psu)
Guide the cable alongside the xBuddy box over the zip ties. STEP 22 Connecting the BLACK PSU cable: parts preparation For the following steps, please prepare: Power terminal screw 6/32" (4x) M3x6 screw (1x) M3w washer (1x) Zip tie (3x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 137: Step 23 Connecting The Black Psu Cables: Pe Cable
Secure all power cable connectors with the terminal screws. Tighten the screws firmly. Verify the correct placement of the cables comparing it to the picture. This is crucial! Incorrect wiring may cause damage to your printer! Now, go to Securing the PSU cables Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 138: Step 25 Silver Psu - Pe Cable: Parts Preparation
Zip tie (5x) STEP 26 Inserting M3nEs nut (SILVER PSU) From the inner PSU side of the short extrusion, insert the M3nEs nut between two cable clips. The exact position of the nut doesn't matter. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 139: Step 27 Guiding The Pe Cable (Silver Psu)
Attach the joint of cables to the M3nEs nut in the extrusion profile and secure it by fully tightening the M3x6 screw. The free extended PE cable must be in the left position and lead freely outside the printer. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 140: Step 29 Connecting The Extended Pe Cable (Silver Psu)
Start tightening the zip tie so it is snug and holds the wires on both sides. Be careful not to over-tighten the zip tie as it could damage the wires. Cut off the remaining part of the zip tie very carefully. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 141: Step 31 Guiding The Power Cable Bundle (Silver Psu)
Leave it free for now. Guide the PE cable from the xLCD through the cutout in the frame and include it in the cable bundle. Secure the cable bundle with the zip tie. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 142: Step 33 Power Panic Extended Cable (Silver Psu): Parts Preparation
However, specific instructions will be provided if there are differences for the silver PSU. Pre-screw the remaining terminal screws into the terminals on the xBuddy board. Do not tighten the screws completely, 3-5 turns will be sufficient. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 143: Step 35 Connecting The X And Y Motor Cables (Silver Psu)
M3w washer and the M3x6 screw. Tighten the screw firmly. Note the correct orientation of the PE connector. Guide the PE cable so that it does not interfere with the threaded hole under the xBuddy board. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 144: Step 37 Connecting The Silver Psu Cables
Verify the correct placement of the cables comparing it to the picture. This is crucial! Incorrect wiring may cause damage to your printer! STEP 38 Connecting the power panic cable (SILVER PSU) Plug the power panic guiding from the PSU into the power panic extended cable. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 145: Step 39 Securing The Psu Cables
Guide the Z motor left cable through the cutout in the frame to the xBuddy box. Carefully tighten the zip tie. Cut off the excess of the zip tie. Do not overtighten the zip tie, it may fatally damage the cable. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 146: Step 41 Connecting The Xlcd Cables
Connect the extruder main cable to the slot in the right side of the xBuddy. Arrange the cable according to the picture. Tighten the cable bundle (extruder main cable and the motor cables) with the two upper zip ties. Do not overtighten the zip ties! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 147: Step 43 Time For Energy Delivery
STEP 44 Almost there! Wasn't as hard, right? You are almost there! Just compare the xLCD assembly and the cable management to the pictures. Let's go the next chapter: 7. Y-carriage & Heatbed assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 148: Y-Carriage & Heatbed Assembly
7. Y-carriage & Heatbed assembly Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 149: Step 1 Tools Necessary For This Chapter
7. Y-carriage & Heatbed assembly STEP 1 Tools necessary for this chapter For this chapter, please prepare: 1.5mm Allen key 2.0 mm Allen key 2.5mm Allen key Torx T8/10 key Needle-nose pliers Phillips screwdriver PH2 Universal wrench Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 150: Step 2 Heatbed Cable Assembly: Parts Preparation
The one on the left with "GND" sign must be connected to the BLACK WIRE. Take both Heatbed cables. Note the label on each cable. For the following steps, prepare the ends of the cables without the label. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 151: Step 5 Heatbed Cable Assembly (Part 3)
Press them gently, but leave a gap between them. Now, tighten both screws firmly using the Allen key and the wrench. Maintain the position of the connectors while tightening. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 152: Step 6 Covering The Heatbed Cables: Parts Preparation
M3x10 screw (3x) M3n nut (3x) Textile sleeve 5x350 (1x) STEP 7 Assembling the heatbed-cable-cover-bottom Insert three M3n nuts into the shaped openings in the heatbed- cable-cover-bottom. Use the screw pulling technique. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 153: Step 8 Assembling The Heatbed-Cable-Cover: Nylon Filament
See the correct orientation in the picture. Secure the cover with the M3x10 screw from the top. Tighten the screw firmly. Make sure the nylon filament is still bent upward as in the previous step. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 154: Step 10 Assembling The Heatbed-Cable-Cover-Top
Make sure there is no big gap between both covers. STEP 11 Wraping the textile sleeve Finish wrapping the cable bundle in the textile sleeve. And twist the sleeve, not the cables. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 155: Step 12 Y-Carriage Versions
Y-carriage (1x) Bearing clip (3x) Rubber bearing pad 31x16x1 mm (3x) Plastic bearing pad 31x16x0.5 mm (3x) M3x12 screw (6x) take from Y- carriage Fasteners package M3nN nut (6x) take from Y-carriage Fasteners package Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 156: Step 14 Bearing Clip Assembly (Old)
From the opposite side, secure each screw with the M3nN nut. Do not tighten the nuts, 1-2 turns are enough for now. Insert the bearing into the bearing clip. If the bearing cannot be inserted easily, you have probably tightened the M3nN nuts too much, loosen them. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 157: Step 16 Bearing Alignment (Old)
We will tighten the screws firmly later on. Using the 2.5mm Allen key and the universal wrench, slightly tighten the M3nN nuts. Do not tighten it completely, just secure the bearing orientation and position. We will completely tighten it later. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 158: Step 17 Bearing Attachment (Old)
Do not tighten it completely, just secure the bearing orientation and position. We will completely tighten it later. STEP 18 Smooth rods: parts preparation (OLD) For the following steps, please prepare: Y-rod-holder (4x) M3x10 screw (12x) M3nS nut (12x) Smooth rod 8x330 (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 159: Step 19 Inserting Smooth Rods (Old)
After the final tightening, the movement of the smooth rods must be gentle. If the smooth rod moves stiffly, loosen the screws and repeat the procedure. Now, please continue to step Preparing Y-rod-holder. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 160: Step 20 Y-Carriage: Parts Preparation (New)
Insert the plastic bearing pad on the screws. Repeat the same for the remaining two bearing clips. The order of the pads is crucial. Check the order on all three bearing clips. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 161: Step 22 Bearing Alignment (New)
Bearing installation (NEW) Note the three pockets for bearings in the Y-carriage. Start with the side with the one pocket. Attach the bearing clip on the cutout. Insert the bearing into the bearing clip. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 162: Step 24 Bearing Attachment (New)
We will tighten the screws firmly later on. After securing the clips double-check the correct position of the bearings so that they do not touch the edges of the pockets. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 163: Step 26 Smooth Rods: Parts Preparation (New)
Two-bearing side: the bearing must be positioned closer to the center of the Y- carriage. It must not touch or extend over the edge of the pocket. Single-bearing side: the bearing must be in the center of the pocket. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 164: Step 28 Preparing Y-Rod-Holder
Check the correct position of the Y-rod-holders. The screw hole must be facing up and towards the center of the Y-carriage (see the picture). Repeat for the remaining Y-rod-holders. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 165: Step 30 Installing The Y-Carriage
Move the Y-carriage back and forth across the entire length of the smooth rods to align them. Then move the carriage to the front plate and tighten all screws in the front-Y- holders. Move the Y-carriage to the rear plate and tighten all screws in the back-Y-holders. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 166: Step 32 Assembling The Y Belt: Parts Preparation
(a few turns are enough). Do not tighten the screw, pull the nut all the way into the Y- belt-holder. Don't forget to remove the M3x40 screw from the part and keep it aside for later use. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 167: Step 34 Assembling The Y Belt
Guide the Y-axis belt around the Y-axis motor pulley. Make sure the belt is inside the frame, not under! Take the free end of the Y belt guiding from the pulley and push it into the groove in the Y-belt-tensioner. Secure it with the M3x10 screw. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 168: Step 36 Assembling The Y Belt Tensioner
- one tooth in each printed part will be vacant. Insert the M3x40 screw into the Y-belt-tensioner and tighten it until the screw reaches the nut in the second part. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 169: Step 38 Tensioning The Y Belt
The belt tuner app was tested on multiple phones and should work across all most common phone manufacturers. However, in some rare cases it might not work as expected. Please state your brand and model in the comments below the step. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 170: Step 40 Aligning The Y Belt
Tighten both screws on the pulley. STEP 41 Expansion joints: parts preparation For the following steps, please prepare: Expansion joint (8x) M3x6r screw (8x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 171: Step 42 Expansion Joints Preparation
Maintain the position and tighten the M3x6r screw using the 2.0mm Allen key. Proceed the same for the rest of the expansion joints. For the OLD Y-carriage without recesses, maintain the correct position and orientation of the expansion joint using the universal wrench while tightening! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 172: Step 44 Attaching The Heatbed: Parts Preparation
Put the heatbed on the Y-carriage and secure it by the M3x14bT. Do not fully tighten the screw yet. Insert the M3x4bT screws into the remaining holes in the heatbed. Do not fully tighten the screws yet. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 173: Step 46 Tightening The Heatbed
Last four screws (corners) Tighten the screws gently, but firmly. STEP 47 Guiding the heatbed cables: parts preparation For the following steps, please prepare: MK4S-Wifi-cover (1x) ESP-WiFi (1x) M3x12 screw (3x) Power terminal screw 6/32" (2x) Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 174: Step 48 Assembling The Wi-Fi
Place the black heatbed cable on the left terminal and secure it with the terminal screw. Place the red heatbed cable on the right terminal and secure it with the terminal screw. Connect the heatbed thermistor cable to the xBuddy board. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 175: Step 50 Installing The Wifi Cover Assembly
Close the WiFi cover carefully, ensuring the pins of the ESP module are properly engaged in the connector on the xBuddy. Double-check that the heatbed cable bundle is in place. Secure the cover with three M3x12 screws. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 176: Step 51 Nfc Antenna: Parts Preparation I
7. Y-carriage & Heatbed assembly STEP 51 NFC antenna: parts preparation I. For the following steps, please prepare: xBuddybox-cover (1x) El-box-cover (1x) M3x6 screw (4x) M3x10 screw (2x) The list continues in the next step ... Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 177: Step 52 - Nfc Antenna: Parts Preparation
This NFCcoil version is pre-assembled, with the antenna cable and adhesive layer attached to the NFCcoil. If you have the pre-assembled version, proceed to the next step; otherwise, go to Connecting the NFC antenna. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 178: Step 53 Installing The Nfccoil (Pre-Assembled)
The antenna cable and the cable solder joint on the NFC coil board must be oriented as shown. Stick the NFCcoil on the inner side of the El-box-cover approximately like in the picture. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 179: Step 54 Connecting The Nfc Antenna
BE EXTRA CAREFUL when connecting the NFC antenna cable connector. Excessive pressure or misalignment can cause irreversible damage. Leave the other end of the cable free for now. If you connected the pre-assembled version, go to Verify all connections once more!. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 180: Step 55 Preparing The Nfccoil
Stick the adhesive film on the cleaned side of the NFCcoil approximately as shown. The side without the company logo. Do not put the the adhesive tape over any holes in the board! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 181: Step 56 Assembling The Nfc Antenna
Before covering the electronics, check and compare your wiring. Compare your cable management with the third picture. Make sure that all connectors are fully inserted and PSU cables properly tightened. Otherwise, there is a risk of damage to the printer! Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 182: Step 58 Covering The Xbuddy Box: Bottom Cover
Carefully cover the xBuddy box by first sliding the bent part of the cover into the box. Avoid pinching the cables. Double-check the NFC antenna cable position. Align the xBuddy box cover with the xBuddy box and secure it with four M3x6 screws. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 183: Step 60 Filament Guide: Parts Preparation
Insert the two PTFE tubes into the marked openings. Fix the tubes in place with two M3x10 screws from the other side. Insert the third M3n nut into the opening on the side. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 184: Step 62 Filament Guide Assembly (Part 2)
STEP 63 Haribo time! Eat another five gummy bears. Did you know that the bright colors of gummy bears are achieved through the use of food coloring, which adds to their visual appeal. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 185: Step 64 That's It
Let's move to the last chapter: 8. Preflight check If you end up with an unused Y-carriage Fasteners bag, it means it was not needed for your printer version. That’s okay—you can keep the contents as spares. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 186: Preflight Check
8. Preflight check Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 187: Step 1 Attaching The Print Sheet
#1 cause of prints detaching from the print surface is a greasy print sheet. IPA (Isopropyl alcohol) to degrease it if you have touched its surface before. We are using a print sheet with a smooth surface. However, the same procedure applies to other variants. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 188: Step 2 Firmware Update
If the "New firmware available" screen appears, hit FLASH by pressing the rotary knob to upgrade to the latest firmware. If no such message appears, the printer is running the latest firmware already. Proceed to the next step. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 189: Step 4 Printer Setup
On the Printer setup screen, select your printer type if it is not already set as the default. Leave the other items unchanged unless you have installed custom parts on the printer (e.g., nozzle with a different diameter, silicone sock removal). Hit Done to complete the printer setup. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 190: Step 5 Network Setup: Wi-Fi Connection (Optional)
The transfer is via NFC, so when prompted by the app, hold your phone close to the NFC antenna. After successful data transfer, you will be prompted on the printer to confirm and then connect. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 191: Step 6 Network Setup: Prusa Connect (Optional)
To continue with the instructions to add the printer to Prusa Connect, hit Yes. And follow the instructions on the printer screen. Ensure you have the Prusa mobile app ready on your phone. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 192: Step 7 Wizard - Selftest Start
Tap the nozzle from below. In case the Loadcell does not detect the touch, you will be prompted to repeat the step. Otherwise, you will see Loadcell test passed OK when it succeeds. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 193: Step 9 Wizard - Gearbox Alignment
There should be no filament inside the extruder before the calibration process starts. Once prompted to, insert the filament end into the opening on top of the extruder. Remove the filament after the calibration finishes. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 194: Step 11 - Wizard Complete
Did you know that Haribo gummy bears are one of the most important parts of the Original Prusa printers assembly instructions. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 195: Step 13 Loading A Filament
The printer is now ready to print! You can start by printing some of our test objects from the bundled USB drive. The sample objects are also available on the official Prusa Research Printables profile Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 196: Step 15 Prusaslicer For Mk4S
Open the PrusaSlicer app. If you’re running it for the first time, Configuration Wizard will show up. Visit the Prusa FFF tab in the Wizard, select Original Prusa MK4 in the 0.4mm nozzle version (the default nozzle size) and hit Finish to start using the MK4 printer profile. -
Page 197: Step 17 Quick Guide For Your First Prints
Looking for inspiration on new projects? Check our blog for weekly updates. If you need help with the build, check out our forum with a great community :-) All Prusa services share one user account. Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 198: Manual Changelog
Manual changelog Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 199: Step 1 - Version History
Versions of the guide: 8/2024 - Initial version 1.0 12/2024 - Updated to version 1.01 STEP 2 Version history Versions of the MK4S kit manual: 08/2024 - Initial version 1.00 12/2024 - Updated to version 1.01 Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade... -
Page 200: Step 3 - Changes To The Manual (1)
Manual changelog STEP 3 Changes to the manual (1) 12/2024 - NFC antenna New version of the NFC antenna. Added instructions for a pre- assembled NFCcoil version included in kits starting December 2024. Manual version 1.01... - Page 201 Notes:...
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