My son and I got a 3d printer over the summer. We didn’t like any of the existing mini holder designs so came up with our own. The sections with the cork spin on the holder you can get to any angle, and the plastic is just slightly flexible so you can get a good grip. I like that I can set the double on down on the desk and not have to worry so much about holding it steady.
The round cork is just wine bottle cork so replacements are readily available in the right size.