Dumbell holder / rack

A holder for dumbbells. Mainly for dumbbells with the hexagonal weights, but could be use for any I believe. I wanted something to keep them from rolling around in the back of my car. This holder does that. I opted to just put on holder per weight - that way the length of the weight doesn't matter.

The 3mf file has some modifiers to add extra perimeter walls around the screw holes just to give them more strength under compression from the screws.