Update: New Version with different outer shell and better tolerances.
There are two versions available, one main body with a deeper slot for the stem and a second one with a different stem design and a shorter slot.
I added an adapter cap for the Pax 2/3 Tools by gruppler (https://www.thingiverse.com/thing:963088) to load the press with the funnels.
After a few prototypes in PLA i did print a PETG version for improved stability while pressing. The fit is not a 100% with the PETG version but that might be due to my older printer(which i mainly use for petg). Would love to hear your feedback.
This is a work in progress as i will add improvements as i continue testing, but i wanted to share what i got so far.
I did print the cap with extra bottom layers to make the top portion of the cap completely solid, since it can otherwise get indented by using the press with decent force.