Post-customstart axes mode failsafe #337
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customstart may fail to restore extruder to absolute mode, so reset extruder position and extrusion mode
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So... the behavior of G90 differs slightly between RepRap and Marlin. Marlin also sets the extruder axis to absolute mode but RepRap requires the use of M82. Both support M82, so I'll re-add that in the next commit. |
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G90 and M82 are already in the start gcode. Is the important addition here the G92 E0.0? |
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The problem is that the custom start gcode might undo the earlier G90 and M82. The changes in this pull request reapplies G90 and M82 after the custom start gcode. We can't trust the user (i.e. me) to tidy up after themselves, so we cleanup after them. |
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The Simplify3D generated G-Code uses absolute extruder and XYZ position values. If the user's custom start gcode sets it to relative and fails to set it back, the printer will be operating in the wrong mode.
Notably PrusaSlicer profiles for Prusa machines includes start g-code that sets the extruder to relative mode (M83) and doesn't change it back.