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But for the code below, we set a feedrate of 1500 mm/minute first, then do the move described
above accelerating to a feedrate of 3000 mm/minute as it does so.
G1 F1500
G1 X90.6 Y13.8 E22.4 F3000
To reverse the extruder by a given amount (for example to reduce its internal pressure while it
does an in-air movement so that it doesn't dribble) simply use G0 or G1 to send an E value that is
less than the currently extruded length.
Note: not all firmware supports this function (change feedrate during movement). For
example,
Marlin
will use the new feedrate at the very beginning and will not change during the
movement.
For the first example, it keeps fixed feedrate during movement; for the second one, it changes the
feedrate during the movement, so for below code, the feedrate will first be accelerated to 3000
mm/minute and then reduce to1500 mm/minute.
G1 F1500
G1 X90.6 Y13.8 E22.4 F3000
G1 X80 Y20 E36 F1500
For the filament retraction, we can reverse the extruder motor to reduce its internal pressure while
it does an in-air movement so that it doesn't dribble, which can greatly reduce burr defect during
the printing. Specific operation: send G1 Ennn command to RepRap, in which the nnn should be
lower than the current value.
G28: Move to Origin
Example: G28
FiveD
Teacup
Sprinter Marlin
Repetier
Support
yes
yes
yes
yes
yes
When the RepRap firmware receives this command, it moves all (or the supplied) axis's back to
the zero endstops as quickly as it can, then backs off by a millimeter and slowly moves back to the
zero endstop activation points to increase position accuracy.
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