Simple and small screws or fixation pins
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Simple and small 'screws' or fixation pins

If small 2 4 mm screws should be printed and you fail with the thread this alternative could be considered models ...

similar models —

Simple and small 'screws' or fixation pins alternatives
Screw Top Pill Box
flankmostrum
Simple hook
Petr Bojar
Table clamp
Josef Průša