M3 screw knob
thingiverse
These small knobs are designed for the head of M3 screws, and they can be used to secure belt tighteners on a 3D printer. The hole in each knob is precisely D2.5mm deep, allowing you to tighten the screw securely. For optimal results, it's recommended that you tap an M3 thread into the hole or simply turn the screw until it's snugly in place. Printed without any support structures. A brim was used to ensure a secure base. A layer height of 0.16mm was employed during printing. The infill density is set at 25%.
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