How do you import a multi-part object into PrusaSlicer without losing the position of the parts? For example, I want to print a two-material interlocking structure like this:
I've tried exporting this from my CAD software (OnShape) as a mesh (STL or OBJ) but when I import it into PrusaSlicer (v2.7.0) the result is either a single object with no internal walls:
or (3MF) two objects placed on the build plate individually, so they no longer interlock:
If I use a STEP file it at least preserves the position of the parts within a single object, and there are some internal walls, but no internal top and bottom layers which I want for structural reasons (in this case the dovetail will simply crush in the XY plane if the part is tensioned in the Z axis):
What's a good way to import multiple parts and have them "print in place", like they were in the original design?