I designed a Tamper for a Portafilter with a 51mm diameter. You can print the parts separately and screw them easily together. Recommendations: I definitely would recommend using food safe material for the bottom part. A good company that provides this filament is FormFutura: HDGlass
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STL file Coffee Tamper 54mm ☕・3D printer design to download・Cults
espresso tamper 3D Models to Print - yeggi