I needed a Pointer type Knob to fit a 1/4" shaft, and after a little mod, this one works well. The Setscrew Hole is sized to tap 3mm or #6-32 for a 5mm or 1/4" Grub Screw SHHC or flat blade type Thanks, jeplans.
iPRINT 3D, HATCHBOX, Tianse, etc. PLA, PVC, PETG
Blue or whatever works
I used PLA with an extruder temp of 220ºC, bed temp at 45ºC, and fan at 32% after the bottom layers are printed. FR was set to ~70% to keep the small holes clean.
Tap back hole 3mm or #6-32 for Setscrew.