Coffee grounds knockbox
thingiverse
For your espresso grounds, been using mine for the last 3 months and still in one piece. Pin sits in a rail so it can be removed for cleaning. 2.5 mm wall diameter for the box. 4 mm wall diameter on the pin, sturdy enough to take a few whacks. The pin has to be printed flat (not upright) as the layers go the wrong way and will delaminate otherwise. 25% infill 0.28 mm layer height
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