I was gifted a Rocket Faustino coffee grinder a year or two back. This is an excellent grinder, with one design flaw. The bean hopper that comes as original equipment has a constriction in the bean flow, I know not why. The result of this constriction is that beans with any surface oils get jammed up in the hopper, unable to fall into the grinder mechanism. In use I found myself constantly shaking the hopper to free the beans so that they can travel to the very excellent grinder mechanism.

I redesigned the bean hopper to remove the constriction. Beans can now flow unimpeded into the grinder. The closing slide is some .05 aluminum I had laying around. I printed this in clear PETG. I have included the .f3d file if you want to play around with this. The original hopper lid should fit this fine if your printer is properly calibrated.

Creality

Ender 3 Pro

No

Yes

0.25

15%

This will print fine in any food safe filament. Watch that you orient supports in the closer slot to a 45 degree angle to the structure of the slot.

A clear or transparent print is desirable but not really critical. I thought Overture clear PETG matched the brushed stainless parts of the printer pretty well.