Bender Tamper
thingiverse
It's a 58mm tamper but it can be scaled to any size in cura. I've printed it for a 53mm portafilter.
Download Model from thingiverse
With this file you will be able to print Bender Tamper 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 Bender Tamper.