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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.