Avoid collisions when moving Z down #7208
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Avoid collisions with previous extrusions in the same layer when moving Z down in an XYZ move. This happens for example when starting a scarf joint after another perimeter was already printed. Fixes SoftFever#7191
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Avoid collisions with previous extrusions in the same layer when moving Z down in an XYZ move. This happens for example when starting a scarf joint after another perimeter was already printed.
Fixes #7191
Description
Set
set_current_position_cleartofalsein GCodeWriter.cpp for any XYZ travel move that moves below the "nominal Z height", which I assume means the current layer printing height. This causes the move to be split into an XY move followed by a Z move in the logic below.I found this solution cleaner than inserting special case handling in every branch of
GCodeWriter::travel_to_xyz, since it uses the move splitting logic that is already there and proven to work.Screenshots/Recordings/Graphs
The offending move is split into XY and then Z components. Compare screenshots in #7191.
Tests