Watch band shortener tool
thingiverse
A watch band shortener tool remixed from two designs that requires only a metal pin. In picture a 1cm needle part is used (half of it goes deep inside to keep it firmly) which works really well. You need a base, pusher and a knob. There are few versions of knobs with different grips but identical in functionality. Pusher 1 has smaller holes for needles or tiny nails while pusher 2 has a bit bigger holes. They can also be turned around to get even more flexibility in positioning. Print with 4+ walls and 0.12 - 0.16 layer height to make it really strong.
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