My Wife's LumiSpa stopped working because of the Head support that rotates the whole thing.
This piece was shattered into a few pieces, so I glued it back together to be able to take measurements.

About the 4th try I got it right, now my Wife's LumiSpa is working again and my 3D-Printer has finally been Wife-approved :)

Update 06/2025
Re-printed this on a new printer and noticed that the old design was flawed, it fitted only because my old printer had bad tolerances. So I re-created it from scratch with FreeCAD.
Included is also the FreeCAD file, in case you need to adjust the size.