I stumbled upon model for bolt and nut with knurled interface https://www.thingiverse.com/thing:9095. I liked how it looks so I decided to adjust nut model and make it to become hand wheels knob for my CNC 3018 X and Z axis. It turned out pretty good.
Knob radius is 24 mm and thickness is 10 mm. It is meant to be used on 8 mm lead screw so it has 8.1 mm hole which is big enough that knob tightly sits on leading screw so it can easily turn leading screw.
There are holes for 3 mm screws if there is need to additionally secure knob on the lead screw.
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