Parametric hex head screw or nut knob

youmagine

Parameters include top part diameter and height, bottom part diameter and height, knurling radius, count and pointiness, bolt diameter and hex head size and depth. I've used this so far to create knobs for a 1/4" bolt and an M4 screw (pictured). The M4 has the pointiness dialed down and the head is proportionally larger to provide more torque. You can make it whatever you like. One STL file is for a 1/4" hex head bolt - I used this on a tripod head. The other is for an M4 screw. To create different knobs, grab the SCAD file and adjust the parameters. This prints upside down so a bridging layer is printed between the hex head and the shaft cutout. It's possible to print without that support layer but it doesn't turn out as nice. Simply cut that out with a knife or a drill and you're ready to go.