by danielpublic, published
Licence: Design, parts, files: GPLv3. Pics & doc: CC-BY-SA.
Made with FreeCAD: reprap.org/wiki/Freecad (Resources etc.)
Inspired by Kean's M3 Thumbscrews. With added room for a penspring.
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Print. Fiddle. Adjust.
Play around in FreeCAD; adjust & print. If you still need any other sizes than M3, feel Free to post the specs on the size you want and I'll upload it.