I needed a way to organize my hats, and the closest thing that i found that made sense to me was this file https://www.thingiverse.com/thing:1366821

It's really good but I had a couple of ideas to improve it, mainly simplifying it to just ONE file and removing the need of glue to attach every piece, thanks to dovetails.

To mount it on a wall/door, just drive a screw into the wall/door leaving some space for the rack module to hold on to (every module has a slot for a screw).

I have nine modules on just one screw, but you can put as many as you thinks is necessary.

If you don't like the look of the top and bottom modules (the dovetails), you can just slice the top and bottom of the module file and create covers as seen in one of the images above, any question just post it in the comments.