I think that's because I was not understanding the relative vs absolute modes. So I just need to read and learn more about gcode
Yep. That's what the M82 and M83 commands are good for...
I think this plugin uses G90 and G91 too (not sure)
And while you're at it, keep in mind:
While using UltiGCode the E-coordinates are interpreted as mm^3 (volumetric).
A relative value of +400 should give you an extrusion of approx. 62mm - if not there was something wrong with the relative/absolute mode...
And yes - the extrusion of very large distances is prevented by the firmware - the limit is 1000mm per command (approx. 6379mm^3 for 2.85mm filament). If you try a larger (relative) move of the E-axis - it's just ignored.
A connected printrun/pronterface is not a bad idea for debugging btw.
You get a warning on the serial console in those cases.
Nevermind on this. I think I just need to read an experiment. I'm getting weird results from some of my attempts, such as the filament getting retracted almost back to the feeder. I think that's because I was not understanding the relative vs absolute modes. So I just need to read and learn more about gcode
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