PS 2.9.4 adding variable width lines to first three layers of vase mode
I'm baffled by what is happening in PS on this model. This is a thin wall model with the wall thickness set to the extrusion thickness in PS. The first three layers are extruded in a clearly jerky fashion during printing, and looking at the code, instead of using a uniform width for the extrusion, it's varying wildly from 0.47 to 0.79mm. The width of all layers is set to 0.8mm (0.4mm nozzle, eSun PLA-LW expanding filament with a 0.5 extrusion factor / 200% expansion at 270-280C).
Once the slicer gets to layer 3, ~0.6mm, it switches to a uniform extrusion at 0.8mm, but the bottom of the print is just trash when this happens.
Edit: I've checked that it's not in the Fusion output by sinking the file 1-3mm into the bed. Regardless of the start point on the cylinder, everything above the 3rd layer is uniform and thee first layers are variable width. However, using a PrrusSlicer primitive cylinder at the same size does not produce the first layer variable width.
PS-
As a side note, can PrusaSlicer do G2 / G3 moves? I've previously use Cura with ArcWelder to produce 3D curves for cylindrical vase mode prints, but no matter how fine I set the export options in Fusion all I get are G1 moves and very approximate cylinders (compared to the accuracy of the model), even with G2/G3 enabled and slice/gcode resolution set to 0.