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FullControlXYZ / fullcontrol

Python version of FullControl for toolpath design (and more) - the readme below is best source of information
GNU General Public License v3.0
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[BUG] Issue with G1_E0 mode when using M82 (absolute extrusion) configuration #102

Closed xmenage closed 3 months ago

xmenage commented 3 months ago

Describe the bug Travel command generated with a combination of M82 (absolution extrusion values) and G1_E0 modes generate incorrect travel commands.

To Reproduce Steps to reproduce the behavior:

  1. Configure initialization data with:
    • "relative_e": False
    • "travel_format": "G1_E0"
  2. Generate gcode
  3. view in prusa viewer or print.

When viewed in prusa in shows much thicker lines than expected. When printing it extrudes large quantities of material then retracts a lot. I print clay, so no big deal, although might not work so well on other printers.

Analysis of gcode shows that "travel command" have an E0 at the end which is interpreted as a large negative move for extrusion from the previous positive value. I could see it was interpreted that way on the printer (Vormvrij Lutum) as it would extrude a large quantitiy of material on a short distance, then retract

Here are a few lines of gcode obtained this way G1 F6000 X81.2889 Y85.6406 E0 G1 F2400 Y32.7382 E525.215838 G1 F6000 X84.4889 Y38.1464 E0 G1 F2400 Y80.2323 E542.631093 G1 F6000 X87.6889 Y76.7977 E0 G1 F2400 Y41.5811 E557.203831 G1 F6000 X90.8889 Y43.2235 E0 G1 F2400 Y75.1553 E570.417298

Expected behavior Travel without extrusion, then resume extrusion on the next G1 command that contains non 0 value for E.

I find the issue does not show if I either remove the E0 or I copy the Exxx parameter from the previous line. This makes sense when using absolute values for extrusion.

Easy workarounds:

fullcontrol-xyz commented 3 months ago

Thanks for this. Just fixed the issue in a commit. Now absolute extrusion mode will work with "G1_E0" format. The E value is the same as the previous line. Please give it a test then close this issue if all good!

xmenage commented 3 months ago

It works, see below the new gcode generated for the same steps

G1 F6000 X81.288943 Y85.640608 E503.324651 G1 F2400 Y32.738154 E525.215838 G1 F6000 X84.488943 Y38.146444 E525.215838 G1 F2400 Y80.232319 E542.631093 G1 F6000 X87.688943 Y76.797692 E542.631093 G1 F2400 Y41.58107 E557.203831 G1 F6000 X90.888943 Y43.223485 E557.203831 G1 F2400 Y75.155277 E570.417298

Thanks !