14 inch compatible Minature Vice 20
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1/4 inch compatible Minature Vice 2.0

This is a great desktop vice design by HDCreator The main problem is that in the US it is almost impossible to purchase fully threaded M6 bolts over 40mm with hex heads 14 inch bolts are very close but the designs tolerances are too tight ...

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1/4 inch compatible Minature Vice 2.0 alternatives
14 number pyramid
Rocket printer