Chuck designed and made this very useful bench clamp on his 3d printer. It uses some M6 metal bolts and nuts but it can easily be converted to other sizes.
It goes through a hole in a workbench and holds objects safely in place so you can work on them.
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Project page:
https://www.thingiverse.com/thing:2444557
It goes through a hole in a workbench and holds objects safely in place so you can work on them.
Project page:
https://www.thingiverse.com/thing:2444557