Really cool design, thank you!
I made 5 star, no customization on Monoprrice Select V2. Has some play, does not need loosening and spins with no efforts. Main thing is to do two changes in the slicer:
Outer shell print first - ensures dimensional accuracy.
-0.2 offset on first layer - reduce elephant foot effect (credit to billbo1958 for pointing out).
If you dont set 'outer shell prints first' which is disabled by default, at least in Cura 3 slightest over-extrusion will make print wider causing blockage.When outer shell is first all extra filament expands inside the object keeping dimensions right even if your extruder calibration, filament size and flow rate are not perfect.