Simple wallmounted spool holder

This is a simple wall-mounted spool holder I designed for the local hackerspace, meant to be mounted on a wall, and to accommodate a lot of spools.

I used onshape to design the part, which is free as long as you don't host a ton of space intensive things or 10 private docs.

Source is this file: https://cad.onshape.com/documents/a37e35227e900fa4ad8ed71e/w/e3a5f48f5ff6cc9b3c0c1d79/e/2e6c273095477605de7e1d0d

It's somewhat variable driven, but not perfectly so.

EDIT:
Added an arm versio