KoffieStamper
thingiverse
I'd be happy to customize a Koffie Stamper for your piston espresso machine. The stamper is designed to fit a 51mm piston, but you're welcome to modify it if needed - I've even included the Fusion 360 file so you can make any changes yourself.
Download Model from thingiverse
With this file you will be able to print KoffieStamper with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on KoffieStamper.