Summary

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.

Don't forgot to like and post your make!