Less is more.
This is a flush knob for a cabinet or wherever a protruding knob might become a hindrance. With a flush front and a threaded back plate, simply drill a 30mm hole in a 16-20mm thick drawer or door front, tighten up, job done. Made from PETG. Scaleable down to about a 20mm hole before the thread tolerances will probably be too tight (estimate).
[ As used on the 3D Printer Cabinet - the base for the Budget Printer Enclosure - link here < Printer Enclosure by Rosti | Download free STL model | Printables.com > ]
The author marked this model as their own original creation.