I took inspiration from the multitude of other dosing cups out there, but none quite looked like I wanted so I modelled this up myself in Fusion360, a few iterations later and I am happy with the results.
Some supports needed for the lips, just from the build plate, I tried both traditional and tree and both remove easy and not too much contact.
Round shape is to help with giving the grinds a shake, internal opening small enough to keep grounds from spilling.
My process is;
Happy Coffee making.