Here is an example of my 3D printed enclosures from Polycase. I simply downloaded the file from Poly Case. Made an .STL out of it in Fusion 360, sliced it in Prusa Slicer and hit the print button. In this case, one was a bit too small for my liking, one was a bit too big, the middle one was just right so I then ordered the actual enclosure which you also see there. I also 3D printed several of the same enclosures in order to practice and test my buddies CNC router to cut the holes. Better to test on a $3 piece of 3D printed plastic than a $20 enclosure. 
What is nice about the CNC router approach instead of just drilling holes is I can still make the anti-rotation flat spot for any of the external connectors and pretty easy to crank out a few. My next purchase will be a table top mini CNC or maybe a CNC router. I figured I’d share a picture before I throw these 3D printed scraps away.
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