Self retracting box cutter / Utility / EDC knife

Self retracting box cutter / Utility / EDC knife

thingiverse

This is a self retracting box-cutter fitting most utility knife blades. You’ll need: 1x Ball pen Spring (~4.5 mm by 30 mm) 1x M3 x 9 mm countersunk screw 1x M3 Nut Printed in 0.1 mm resolution.

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