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OK, I've got a one-line fix to Printer.cpp so there will be no extruder operation on homing. G28 X0 first moves to X=0 and then homes in Z G28 Y0 first moves to Y=0 and then homes in Z G28 Z0 (or G28) moves directly vertical as it homes in Z None of these extrude filament now. diff --git a/Repetier ...

G28 X0 under certain circumstances causes the extruder to run and pump filament out the nozzle.
It should not run the extruder.

Cool. Just a G28 does not exhibit the problem.

I'll debug the Arduino code and see if I can push a fix to GitHub.

Here, I'll go through your example to illustrate, red is the gcode being processed, green is what's actually happening: g0 x0 y0 z50 ; Interpret Gcode, queue move command Printer gets move from queue and starts moving g1 x100 e10 f1000 ; Interpret Gcode, queue move command Printer is still doing fi...

Jrjones wrote:Why are you homing just the X axis on a delta machine?
I would remove the X0 from the G28 command.

Yes, this is the default end G code for the Slic3r slicer.
I changed it to a G28 Z0 and the problem went away.

I'll try your test by adding a G4 P0 and post my results. If a G1 followed by a G92 requires a G4 p0 in between them, the Slic3r is producing incorrect G code. Here's a slice of G code produced by Slic3r. Is it really incorrect? G1 X30.000 Y26.654 E36.69181 G1 X-30.000 Y26.654 E41.58977 G1 X-32.190 ...

OK, I found out it's the G92 E0 combined with a G28 X0 that causes the extrusion. Could you try this? Set your extruder temp to whatever filament you have and wait for it to heat up. g0 x0 y0 z50 ; Move near the bed. g1 x100 e10 f1000 ; Move to the right and extrude some filament g92 e0 ; Set Extrud...

I'm getting a big blob at the end of each layer caused by the G92 E0 command and I'm confused. I've attached a .gcode file for a 20mm flat plate and I get a blob. If I comment out the G92 E0 at the end, I do not get the blob. Can someone help me understand this? Rostock Max V3 FW Version 0.92.2 Octo...