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Table of Contents
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Step 5 - YZ frame: final check
Step 29 - Mounting the Y-belt-idler
Step 32 - Assembling the Y-motor-holder
Step 33 - Adjusting the Y-motor pulley
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Related Manuals for Original Prusa MK4S kit
Summary of Contents for Original Prusa MK4S kit
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Page 1: Table Of Contents
Table of Contents 1. Introduction ....................................... Step 1 - All the required tools are included ..............Step 2 - Additional utilities for this guide ..................... Step 3 - Labels guide ......................Step 4 - Spare bag ............... Step 5 - View high resolution images ................ - Page 2 ....................... Step 36 - It's done! 3. X-axis & X-carriage assembly ..............................Step 1 - Tools necessary for this chapter ............Step 2 - X-axis assembly: parts preparation ............Step 3 - Assembling the X-end-motor (part I) ............Step 4 - Assembling the X-end-motor (part II) ............
- Page 3 ...... Step 19 - Connecting the extruder main cable: parts preparation ............Step 20 - Connecting the extruder main cable ..........Step 21 - Covering the X-carriage: parts preparation ......Step 22 - Covering the X-carriage: inserting the nylon filament ..............
- Page 4 ............... Step 38 - Connecting the extruder cables ................Step 39 - LoveBoard: Wiring check .......... Step 40 - Covering the LoveBoard: parts preparation ............Step 41 - Covering the LoveBoard: side cover ............Step 42 - Covering the LoveBoard: top cover ................
- Page 5 ..........Step 14 - Installing the bearing on the Y-carriage .................. Step 15 - Aligning the bearing ..........Step 16 - Installing the bearings on the Y-carriage ............... Step 17 - Positioning of the bearings ..............Step 18 - Y-axis: smooth rods holders ...........
- Page 6 ..................Step 10 - Wizard complete ..................Step 11 - Reward yourself! ..................Step 12 - Loading a filament .................. Step 13 - Printable 3D models ..................Step 14 - Firmware update ................Step 15 - PrusaSlicer for MK4S ..............Step 16 - PrusaLink &...
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Page 7: Introduction
1. Introduction Original Prusa MK4S kit assembly... -
Page 8: Step 1 All The Required Tools Are Included
Paper towels or piece of cloth - For wiping residual grease off the bearings and smooth rods and as a soft pad for preparing the Y-carriage assembly. No soldering or wire crimping is required. Original Prusa MK4S kit assembly... -
Page 9: Step 3 Labels Guide
There is a bag with spare parts like thermal pads, springs, etc. Spare fasteners are included in each bag of fasteners. The amount of spare is always included in the total number shown on the bag. Original Prusa MK4S kit assembly... -
Page 10: Step 5 View High Resolution Images
STEP 6 Printed parts - versioning Most of the 3D printed parts on Original Prusa MK4S 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 11: Step 7 We Are Here For You
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 MK4S kit assembly... -
Page 12: Step 8 Pro Tip: Inserting The Nuts
Every time we recommend using the "screw pulling technique", you will be reminded with Joe's avatar ;) Parts in the pictures are used as an example. Original Prusa MK4S kit assembly... -
Page 13: Step 9 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 MK4S kit assembly... -
Page 14: Step 10 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 MK4S kit assembly... -
Page 15: Step 11 - How To Successfully Finish The Assembly
STEP 11 How to successfully finish the assembly To successfully finish the MK4S kit please follow all these: Always read all the instructions at the current step first, it will help you to understand what you need to do. Don't cut or trim unless you are told to!!! Don't follow pictures only! It is not enough, the written instructions are as brief as they could be. -
Page 16: Step 12 Additional Information
Additional Information This information applies to users planning to install accessories, such as the Original Prusa Enclosure, or upgrades like the MMU3. Before installing any accessories, it's essential to assemble and test your printer according to the instructions. Once the printer is fully functional, follow the separate MMU3 or Enclosure assembly manual to modify the printer for installation. -
Page 17: Frame Assembly
2. Frame assembly Original Prusa MK4S kit assembly... -
Page 18: Step 1 Tools Necessary For This Chapter
Prepare the following parts to build the YZ frame: Extrusion 3030 120 mm (2x) Extrusion 3030 205 mm (2x) Printer frame (1x) M5x16r screw (16x) Before you proceed further, please place the frame on a flat surface. Original Prusa MK4S kit assembly... -
Page 19: Step 3 Yz Frame: Mounting The Longer Extrusions
Then proceed to the other long extrusion. Be cautious when tightening these screws to avoid damaging the Allen key slot. Ensure the Allen key is fully inserted into the screw head. Tighten the screw firmly but gently. Original Prusa MK4S kit assembly... -
Page 20: Step 4 Yz Frame: Mounting The Shorter Extrusions
Prusa logo. Also ensure longer extrusions are closer together. Short extrusions - must be on the other side of the frame without the Prusa logo. Also ensure shorter extrusions are further away from each other. Original Prusa MK4S kit assembly... -
Page 21: Step 6 Y-Axis: Front And Rear Plate Preparation
Be cautious when tightening these screws to avoid damaging the Allen key slot. Ensure the Allen key is fully inserted into the screw head. Tighten the screw firmly but gently. Original Prusa MK4S kit assembly... -
Page 22: Step 8 Y-Axis: Rear Plate Assembly
Orient the nut with the metal spring facing down. Push the entire nut inside the extrusion using your finger. Use this method for both M3nEs nuts. The exact position of the nuts doesn't matter at this time. Original Prusa MK4S kit assembly... -
Page 23: Step 10 Y-Axis: Preparation For The Psu
Rotate the whole assembly 90 degrees and check again. Repeat the whole process if necessary. If any of the corners isn’t lifting more than 2mm (0.08 inch) high, proceed to the next step. Original Prusa MK4S kit assembly... -
Page 24: Step 12 Mounting Antivibration Feet And Cable Clips: Parts Preparation
Insert and turn 90 degrees to lock it in place. Repeat this process for all 4 feet. Place them 1-2 cm far from the end of each extrusion. Original Prusa MK4S kit assembly... -
Page 25: Step 14 Installing The Cable Clip
"click" in. STEP 15 Installing the cable clips Install three clips to the long extrusion. Install one clip to the short extrusion. Turn the frame, install two clips to the second short extrusion. Original Prusa MK4S kit assembly... -
Page 26: Step 16 Psu: Parts Preparation
- we need the PSU to be able to move slightly so we can adjust its position in the next step! The screws should be able to hold the PSU in a "vertical" position for now. Original Prusa MK4S kit assembly... -
Page 27: Step 18 Securing The Psu
Make sure the PSU is pressed against both the frame and the extrusion on the bottom. Everything aligned? Tighten the M4 screws up using the same 2.5mm Allen key. Now, tighten up the M3 screws on the bottom. Original Prusa MK4S kit assembly... -
Page 28: Step 19 Xbuddy Box: Parts Preparation
For the following steps, please prepare: xBuddy board (1x) Always touch the sides of the electronics board while manipulating it. Avoid touching the chips, capacitors and other parts of the electronics. Zip tie (4x) X-holder (1x) Original Prusa MK4S kit assembly... -
Page 29: Step 21 Mounting The Xbuddy Box: Inserting Screws
Slide the xBuddy box to the frame and attach the box to all 4 screws in the frame. The screws must fit into the top part of the "key" hole. See the detail. Original Prusa MK4S kit assembly... -
Page 30: Step 23 Securing The Xbuddy Box
For the protection of the board's electronic components, we strongly recommend placing the xBuddy board on the soft pad. You can use the original xBuddy bubble wrap package. Peel off the blue protective layer from all thermal pads. Original Prusa MK4S kit assembly... -
Page 31: Step 25 Mounting The Xbuddy Board
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 MK4S kit assembly... -
Page 32: Step 26 Attaching The Zip Ties
Do not discard the X-holder. You will need it later again. Place the printer back on its "feet". STEP 27 Y-belt-idler: parts preparation For the following steps, please prepare: Y-belt-idler (1x) M3x10 screw (2x) M3nS nut (2x) Original Prusa MK4S kit assembly... -
Page 33: Step 28 Assembling Y-Belt-Idler
Mounting the 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 MK4S kit assembly... -
Page 34: Step 30 Assembling The Y Motor: Parts Preparation
For the following steps, please prepare: 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 MK4S kit assembly... - Page 35 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 MK4S kit assembly...
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Page 36: Step 34 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 MK4S kit assembly... -
Page 37: Step 35 Haribo
It's done! 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 MK4S kit assembly... -
Page 38: X-Axis & X-Carriage Assembly
3. X-axis & X-carriage assembly Original Prusa MK4S kit assembly... -
Page 39: 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 MK4S kit assembly... -
Page 40: Step 4 Assembling The X-End-Motor (Part Ii)
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 MK4S kit assembly... -
Page 41: Step 5 Assembling The X-End-Idler (Part I)
From the "bottom" side of the part, insert and tighten the M3x16 screw. 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 MK4S kit assembly... -
Page 42: Step 7 Assembling The X-End-Idler (Part Iii)
For the following steps, please prepare: 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 MK4S kit assembly... -
Page 43: 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 MK4S kit assembly... -
Page 44: 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 MK4S kit assembly... -
Page 45: 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 MK4S kit assembly... -
Page 46: 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 MK4S kit assembly... -
Page 47: Step 17 Assembling The X-Carriage: Parts Preparation
M3nS nut (8x) 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 MK4S kit assembly... -
Page 48: 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 MK4S kit assembly... -
Page 49: Step 21 Assembling The X-Carriage-Clip: Parts Preparation
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 MK4S kit assembly... - Page 50 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 MK4S kit assembly...
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Page 51: Step 24 Attaching The X Motor: Parts Preparation
Note the correct X motor orientation. The cable must be facing you. 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 MK4S kit assembly... -
Page 52: Step 26 Attaching The X Motor: Mounting The Pulley
Tighten the grub screw. 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 MK4S kit assembly... -
Page 53: 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 MK4S kit assembly... -
Page 54: 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 MK4S kit assembly... -
Page 55: 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 MK4S kit assembly... -
Page 56: Z-Axis Assembly
4. Z-axis assembly Original Prusa MK4S kit assembly... -
Page 57: Step 1 Tools Necessary For This Chapter
For this chapter, please prepare: 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 MK4S kit assembly... -
Page 58: 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 MK4S kit assembly... -
Page 59: Step 5 Z Motor Assembling: Parts Preparation
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 MK4S kit assembly... -
Page 60: Step 7 Installing The Z Motors
Guide both the Z motor cables 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 MK4S kit assembly... -
Page 61: Step 9 Mounting The X-Axis Assembly: Parts Preparation
IN THE CENTER of the X-axis by the top smooth rod and then by the printer frame. 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 MK4S kit assembly... -
Page 62: 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 MK4S kit assembly... -
Page 63: 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 MK4S kit assembly... -
Page 64: Step 16 Assembling The Loveboard
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 MK4S kit assembly... -
Page 65: Step 17 Connecting The Extruder Main Cable
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 MK4S kit assembly... -
Page 66: Step 19 Connecting The Extruder Main Cable: Parts Preparation
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 MK4S kit assembly... -
Page 67: 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 MK4S kit assembly... -
Page 68: 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 MK4S kit assembly... -
Page 69: Step 25 Wrapping The Extruder Main Cable
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 MK4S kit assembly... -
Page 70: Step 27 Attaching The Ext-Cable-Holder: Parts Preparation
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 MK4S kit assembly... -
Page 71: 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 MK4S kit assembly... -
Page 72: 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 MK4S kit assembly... -
Page 73: Step 33 Reward Yourself
STEP 34 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 MK4S kit assembly... -
Page 74: Nextruder Assembly
5. Nextruder assembly Original Prusa MK4S kit assembly... -
Page 75: Step 1 Tools Necessary For This Chapter
Torx key TX10/8 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 MK4S kit assembly... -
Page 76: 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 MK4S kit assembly... -
Page 77: 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 MK4S kit assembly... -
Page 78: 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 MK4S kit assembly... -
Page 79: 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 MK4S kit assembly... -
Page 80: Step 11 - Assembling The Nextruder Idler
The screw protrudes from the PG-ring after tightening. 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 MK4S kit assembly... -
Page 81: 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 MK4S kit assembly... -
Page 82: Step 15 Assembling The Idler-Swivel: Parts Preparation
Place the second idler-swivel from the opposite side on the screw. From the other side, attach the M3nN nut onto the screw. Hold the nut using the universal wrench and tighten the screw. Tighten just lightly! The spacer must rotate freely. Original Prusa MK4S kit assembly... -
Page 83: Step 17 Assembling The Idler-Nut
Attach the Idler-swivel assembly on the screws. See the correct orientation of the Idler-nut. The side with version marking must be visible. See the picture. Tighten both screws. Stop tightening as soon as the screw tips reach the front face of the idler nut. Original Prusa MK4S kit assembly... -
Page 84: Step 19 Ntc Thermistor & Fan Holder: Parts Preparation
Secure it with the M3x4T grub screw. Screw it all the way in. Tighten gently, but firmly using two fingers and the short side of the T6 Torx key. Applying more force may cause permanent damage to the thread. Original Prusa MK4S kit assembly... -
Page 85: Step 21 Assembling The Nextruder
There is a cutout in the plastic part. Guide the thermistor cable through this cutout. DO NOT PINCH ANY OF THE CABLES! Align the heatsink screws with the spacers on the X-carriage and join both parts together by tightening them. Start with the middle one. Original Prusa MK4S kit assembly... -
Page 86: Step 23 Connecting The Ntc Thermistor
Guide the NTC thermistor through the cable channel in the X-carriage up to the LoveBoard and connect it to the top right slot. STEP 24 Assembling the hotend fan: parts preparation For the following steps, please prepare: Hotend fan (1x) M3x18 screw (2x) Original Prusa MK4S kit assembly... -
Page 87: Step 25 Assembling The Hotend Fan
LoveBoard. STEP 26 Print fan blower: parts preparation For the following steps, please prepare: MK4S Print fan blower (1x) Fan-case (1x) Fan-case-cover (1x) Fan-shroud (1x) 3x8sT screw (2x) M3x5rT screw (5x) M3nS nut (5x) Original Prusa MK4S kit assembly... -
Page 88: Step 27 Assembling The Print Fan Case
Guide the print fan blower cable through the cable channel in the Fan-case. Close the fan with Fan-case-cover. Secure the cover with two 3x8sT screws. The screws cut thread directly into the plastic, so there might be some resistance. Original Prusa MK4S kit assembly... -
Page 89: Step 29 Assembling The Fan Shroud
Slide the side pockets of the print fan blower assembly onto the two “forks” of the fan holder. Ensure that the holes of both parts are aligned. From the left side of the fan holder, secure both parts together using two M3x5rT screws. Original Prusa MK4S kit assembly... -
Page 90: Step 31 Connecting The Print Fan Blower
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. STEP 32 Inserting the hotend assembly: parts preparation For the following steps, please prepare: Hotend assembly (1x) Thumb screw (2x) Original Prusa MK4S kit assembly... -
Page 91: Step 33 Inserting The Hotend Assembly
If not fully inserted, poor heat transfer may occur, potentially leading to issues like nozzle clogs. To adjust the nozzle position, loosen the thumbscrews, reposition the nozzle, and then retighten the screws, while pushing the hotend assembly up. Original Prusa MK4S kit assembly... -
Page 92: Step 35 Connecting The Hotend Cables
Guide the hotend heater through the cable channel in the X-carriage and connect it to the LoveBoard. STEP 36 Fan door cover: parts preparation For the following steps, please prepare: Fan-door-cover (1x) M3x30 screw (1x) Original Prusa MK4S kit assembly... -
Page 93: Step 38 Connecting The Extruder Cables
Connect the Loadcell cable coming from the right of the heatsink to the upper slot on the right side of the LoveBoard. Connect the filament sensor cable to the lower slot on the right side of the LoveBoard. Original Prusa MK4S kit assembly... -
Page 94: Step 40 Covering The Loveboard: Parts Preparation
Close the extruder idler to the extruder Close the idler-swivel and lock it over the extruder idler assembly STEP 40 Covering the LoveBoard: parts preparation For the following steps, please prepare: LoveBoard-cover (1x) LoveBoard-cover-right (1x) M3x10 screw (1x) Original Prusa MK4S kit assembly... -
Page 95: Step 41 Covering The Loveboard: Side Cover
Slide the Loveboard-cover on the extruder. And push it all the way down. The cover must go behind the X-carriage-back. Be careful not to pinch any cables. Ensure that the two plastic covers fit together perfectly. Original Prusa MK4S kit assembly... -
Page 96: Step 43 Tensioning The X-Axis Belt
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 MK4S kit assembly... -
Page 97: 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 MK4S kit assembly... -
Page 98: 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 MK4S kit assembly... -
Page 99: Xlcd Assembly
6. xLCD assembly Original Prusa MK4S kit assembly... -
Page 100: 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 MK4S kit assembly... -
Page 101: 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 MK4S kit assembly... -
Page 102: Step 5 Covering The Xlcd
Through the opening in the xLCD-support, place the PE Faston on the xLCD with the exact orientation as shown. 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 MK4S kit assembly... -
Page 103: 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 MK4S kit assembly... -
Page 104: 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 MK4S kit assembly... -
Page 105: Step 11 - Connecting The Psu: Parts Preparation
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 MK4S kit assembly... -
Page 106: Step 13 Power Cables Info
Negative (V-) 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 MK4S kit assembly... -
Page 107: Step 15 Connecting The Psu (Part 2)
The red (+) wires are connected into the two terminals on the left. 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 MK4S kit assembly... -
Page 108: Step 16 Connecting The Power Panic
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 MK4S kit assembly... -
Page 109: Step 18 Guiding The Power Cable Bundle
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 MK4S kit assembly... -
Page 110: Step 20 Connecting The X And Y Motor Cables
Guide the cable alongside the xBuddy box over the zip ties. STEP 21 Connecting the PSU cable: parts preparation For the following steps, please prepare: Power terminal screw 6/32" (4x) M3x6 screw (1x) M3w washer (1x) Zip tie (2x) Original Prusa MK4S kit assembly... -
Page 111: Step 22 Connecting The 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! Original Prusa MK4S kit assembly... -
Page 112: Step 24 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 MK4S kit assembly... -
Page 113: Step 26 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 MK4S kit assembly... -
Page 114: Step 28 Time For Energy Delivery
STEP 29 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 MK4S kit assembly... -
Page 115: Y-Carriage & Heatbed Assembly
7. Y-carriage & Heatbed assembly Original Prusa MK4S kit assembly... -
Page 116: 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 MK4S kit assembly... -
Page 117: 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 MK4S kit assembly... -
Page 118: Step 5 Heatbed Cable Assembly (Part 3)
The cable cover, which will be applied later requires the connectors to be slightly inclined towards each other. 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 MK4S kit assembly... -
Page 119: Step 6 Covering The Heatbed Cables: Parts Preparation
Nylon 2x380 mm (1x) heatbed-cable-cover-bottom heatbed-cable-cover-top 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 MK4S kit assembly... -
Page 120: 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 MK4S kit assembly... -
Page 121: Step 10 Assembling The Heatbed-Cable-Cover-Top
On the bottom side, leave a slack on the thermistor cable for one finger to be pushed through. 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 MK4S kit assembly... -
Page 122: Step 12 Y-Carriage: Parts Preparation
Insert the rubber bearing pad on the screws. 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 MK4S kit assembly... -
Page 123: Step 14 Installing The Bearing On The Y-Carriage
Maintain the bearing position and slightly tighten both screws. Just enough to maintain the bearing’s position and orientation. You will tighten the screws firmly later on. Original Prusa MK4S kit assembly... -
Page 124: Step 16 Installing The Bearings On The Y-Carriage
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 MK4S kit assembly... -
Page 125: Step 18 Y-Axis: Smooth Rods Holders
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 MK4S kit assembly... -
Page 126: Step 20 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 MK4S kit assembly... -
Page 127: Step 22 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 MK4S kit assembly... -
Page 128: Step 24 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 MK4S kit assembly... -
Page 129: Step 26 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 MK4S kit assembly... -
Page 130: Step 28 Assembling The Y Belt Tensioner
Y-belt-holder (the one already installed) and reposition the belt by one tooth in both printed parts - 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 MK4S kit assembly... -
Page 131: Step 30 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 MK4S kit assembly... -
Page 132: Step 32 Aligning The Y Belt
Tighten both screws on the pulley. STEP 33 Installing the Expansion joints: parts preparation For the following steps, please prepare: Expansion joint (8x) M3x6r screw (8x) Original Prusa MK4S kit assembly... -
Page 133: Step 34 Preparing The Expansion Joints
The joint must fit into the recess. See the second picture. Maintain the position and tighten the M3x6r screw using the 2.0mm Allen key. Proceed the same for the rest of the expansion joints. Original Prusa MK4S kit assembly... -
Page 134: Step 36 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 MK4S kit assembly... -
Page 135: Step 38 Tightening The Heatbed
Last four screws (corners) Tighten the screws gently, but firmly. STEP 39 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 MK4S kit assembly... -
Page 136: Step 40 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 MK4S kit assembly... -
Page 137: Step 42 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 MK4S kit assembly... -
Page 138: Step 43 Nfc Antenna: Parts Preparation I
M3x10 screw (2x) The list continues in the next step ... STEP 44 NFC antenna: parts preparation II. NFCcoil (1x) Isopropyl Alcohol (IPA) Cleaning pad (1x) Adhesive film 32 x 25 mm (1x) NFC coil cable (1x) Original Prusa MK4S kit assembly... -
Page 139: Step 45 Connecting The Nfc Antenna
Ensure the NFC antenna cable connector is securely plugged in and does not come loose from the board. BE EXTRA CAREFUL when connecting the NFC coil cable connector. Excessive pressure or misalignment can cause irreversible damage. Leave the other end of the cable free for now. Original Prusa MK4S kit assembly... -
Page 140: Step 46 Preparing The Nfccoil
Ensure the NFC antenna cable connector is securely plugged in and does not come loose from the board. BE EXTRA CAREFUL when connecting the NFC coil cable connector. Excessive pressure or misalignment can cause irreversible damage. Original Prusa MK4S kit assembly... -
Page 141: Step 48 Verify All Connections Once More
Make sure there is no cable in the way for the screws and the cover. Secure the el-box-cover by tightening both M3x10 screws to the xBuddy box. Be careful not to pinch the NFC cable when closing the cover. Original Prusa MK4S kit assembly... -
Page 142: Step 50 Covering The Xbuddy Box
Align the xBuddy box cover with the xBuddy box and secure it with four M3x6 screws. STEP 51 Assembling the double spool holder (part 1) For the following steps, please prepare: Centre part (1x) Side arm (2x) Original Prusa MK4S kit assembly... -
Page 143: Step 52 Assembling The Double Spool Holder (Part 2)
STEP 53 Assembling the Filament guide: parts preparation For the following steps, please prepare: Filament-guide (1x) Filament guide PTFE tube (2x) M3n nut (3x) M3x18 screw (1x) M3x10 screw (2x) Original Prusa MK4S kit assembly... -
Page 144: Step 55 Filament Guide Assembly (Part 2)
Make sure the spool holder is inclined towards the back of the printer. Attach the filament guide onto the spool holder. It should click in inbetween the top two ribs, pointing upwards, as seen in the photo. Fix the guide in place using M3x18 screw. Original Prusa MK4S kit assembly... -
Page 145: Step 56 Haribo Time
STEP 57 That's it That was tough. But you made it! Let's move to the last chapter: 8. Preflight check Original Prusa MK4S kit assembly... -
Page 146: Preflight Check
8. Preflight check Original Prusa MK4S kit assembly... -
Page 147: Step 1 Attaching The Steel Sheet
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 MK4S kit assembly... -
Page 148: Step 3 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 MK4S kit assembly... -
Page 149: Step 4 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 at a maximum of 2-3 cm away. After successful data transfer, you will be prompted on the printer to confirm and then connect. Original Prusa MK4S kit assembly... -
Page 150: Step 5 Network Setup: Prusa Connect (Optional)
Prusa Connect and PrusaLink explained. 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 MK4S kit assembly... -
Page 151: Step 6 Wizard - Selftest Start
Do not touch the nozzle yet, wait until prompted by the Tap nozzle NOW message. 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 MK4S kit assembly... -
Page 152: Step 8 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 MK4S kit assembly... -
Page 153: Step 10 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 MK4S kit assembly... -
Page 154: Step 12 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 MK4S kit assembly... -
Page 155: Step 14 Firmware Update
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 MK4S in the 0.4mm nozzle version (the default nozzle size) and hit Finish to start using the MK4S printer profile. -
Page 156: Step 16 Prusalink & Prusa Connect
Please read the 3D Printing Handbook dedicated to your printer and follow the instructions to set up and use the printer properly. The latest version is always available at help.prusa3d.com. Read the Disclaimer and Safety instructions chapters. Original Prusa MK4S kit assembly... -
Page 157: Step 18 Prusa Knowledge Base
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 MK4S kit assembly... -
Page 158: Manual Changelog
Manual changelog Original Prusa MK4S kit assembly... -
Page 159: Step 1 Version History
Manual changelog STEP 1 Version history Versions of the MK4S kit manual: 08/2024 - Initial version 1.00... - Page 160 Notes:...
- Page 162 Notes:...
- Page 164 Notes:...
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