Universal Z axis knob

I made two versions of the knob the first one (universal Z axis Knob) is the one that I printed, the second one (universal Z axis Knob 2.0) has smooth edges and a better look but i've never printed it.

Both versions need an M3 bolt to be tight around the axis. there's a little gap between the base of the knob ant the part where the bolt is fitted that allows it to be adapted tighting the screw. The hole mesures 8.35 mm.

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