Combo lock style panel knob

Designed for a Creality Ender 3 or similar, that has a 6.25mm knurled shaft that sticks out 12mm from the panel.
 

Turn it up to 11!

Or, edit the scad file if you want a different set of numbers.  I rubbed a contrasting-colour plasticine into the markings to make them stand out.  

Photo is from an earlier print, before I changed the number scale.