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harrierpigeon
6cf747808c
A scarf joint begins one layer height below the current layer and ramps up along the wall. On a tilted belt that start is a step backwards along the belt axis, into the previous layer's wall at the seam: 0.283 mm per 0.2 mm layer at 45 degrees. With an aligned seam the nozzle rams the same spot on every layer. A BabyBelt Pro benchy with seam_slope_type=external showed 601 such back-steps from layer 107 on, and in the field the belt "jumped backwards" and the head knocked the part loose. Belt printers now skip the scarf in GCode::extrude_loop, and the process tab greys the scarf controls out for them, as it already does for arc fitting. The regression test slices a cube on a belt with the scarf enabled and checks the belt axis never steps back by a layer pitch.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: