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design your own
ROFL
Oh wow, there's a few of them already on there:
https://www.thingiverse.com/search?q=handpresso+Tamper&type=things&sort=relevant -
The tamper + reamer (https://www.thingiverse.com/thing:1680098) looks the most useful but I can't tell which end of it does the actual tamping. It would be annoying to tamp and have the detachable bit come off all the time.
Without knowing that detail, this one looks the best: https://www.thingiverse.com/thing:2254002 (I wouldn't need the grinder holder piece). Looking at it, I wonder how he gets the little domepod out of his filler without spilling coffee everywhere? Hmm
If you're able to print this one what would like you for it?
If you can find a design you like here
https://www.thingiverse.com/search?q=Tamper&type=things&sort=relevant
Or design your own and send the file to me, I'd be happy to print one for you.