I am printing on a Prusa i3 MK3S+ with MMU2S module using PVA+ soluble material and PLA. Slicing with PrusaSlicer 2.3.1. This question is more about slicing and is probably printer-independent.
My problem is the default pattern makes the surface not smooth. See the attached screenshot from PrusaSlicer (picture from the bottom side, for clarity I hid the lowest layers to make the interface visible):
The resulting object looks like this:
What I wish the slicing would look like:
Any ideas on how to make such a pattern or other ideas to make it better? It doesn't matter if the support is hard to remove because it's soluble anyway.
The simplified STL model: https://zouppen.iki.fi/poista/pirra.stl