A very simple keychain base. I made this in a hurry for a volunteer project, but figured perhaps someone out there might find it useful as well. It's only two shapes in Blender, so I'm making this public domain. Do with it as you will!

Good for putting text or an SVG on top. Or on the bottom, for that matter, if you make sure it's not too big a gap for your printer to bridge over.

Please note that this base was not designed to go directly onto a key ring- you should use a jump ring or connect it to a chain. Otherwise you may find it is quite difficult to wrestle it into place, and I don't think it would move freely around a key ring.