Safety Pin to Badge Back thingy

So this might already exist in droves on Thingiverse, but I wasn't able to find one. That said, not completely sure what it's called, so my search terms were probably just bad.

This is just a simple little thing to make safety pins stand up straight on the back of a printed badge, so you don't need to go buy actual pin-backs or whatever the darn things are called.

The safety pins I used are about 3.3cm long, but I think the model should be re-sizable on the long axis without causing issues.

I've been using hot glue to affix them so far which hasn't had any problems, but super glue may also work fine.

I may modify it slightly to increase the width and depth of the channel in the bottom bit to better hold onto the Safety Pin's bar at some point, but probably only if I ever find it to be a problem.

Edit: Updated this with 4 new variations of the size, as well as added a picture with a ROUGH sizing chart. Hopefully these will give a bit more flexibility with the variances in safety pin sizes.