Summary

Use both STLs to mount a Mac Mini to a board. It's possible to use nuts and bolts on this but I made the screw holes to countersink an appropriate screw. I'm using #8 3/4" sheetrock screws into a pine 2x6 that serves as one of the legs on my electronics workbench. You don't need to use all 8 screws if mounted to a pine board. The Mac Mini is not that heavy. But if you are screwing into composite board, you might want as many screws as possible.

The original designer, ampxtreme, left a 6mm tolerance gap so FELT could be adhered to the mounts, saving the Mac from scratches. My needs didn't include preserving the Mac body so I removed that tolerance.

The Mac is held well so it can only come out one end of the structure, but for my purposes, it can't slide out the open end. I have the connectors facing slightly up so if I plug something in, the Mac won't come off the bracket. If you are placing this level so tugging a cable could pull the Mac out of of the bracket, you might want to add an extra screw standing by itself so the Mac would bump against that screw to stop its slide.

Print the objects to minimize supports, of course. I only needed supports on the slide-through limiter on the 'front part". The side of the object that the screws penetrate is on-edge on the print plate.

I printed it in PETG for that filaments heat tolerance feature.

I pondered making a version of this that added more space between the Mac and the panel it is screwed into. If I see that needed after testing, I'll do that, but I"m hanging my Mac in its side so there is plenty of airflow.