When I printed this I did have a less smooth spot on the left side of the smoothed edge and the same thing was on the opposite side.
I printed this with my elegoo neptune 3 pro at 20% infill, 60mm/s, no supports, 215 degrees, with black PLA (brand: LABISITS).
I designed this part with Onshape online CAD software.
AshTray.stl | 40.4KB | |
EN3PRO_AshTray.gcode | 4.2MB |