Mazzer grinder small hopper with pusher.

thingiverse

This is a replacement for the original hopper. It is intended for people that only grind for single shots and It only holds enough beans for 2 - 3 shots maximum. The plunger sits on top of the beans and weighs down the beans to stop them bouncing around to aid in consistent grinding. Print both parts with the largest end on the plate. No supports. I printed mine from ABS+ but there is no special requirements.