Summary

I designed this a 58mm Gaggia portafilter to be used with Gaggia MDF grinder. It takes two magnets 6mm diameter and 2mm thick, which just press into the holes underneath.

I printed it in PETG at 0.1mm with the curved surface downwards. The first few layers were a bit messy. If I printed it again I would use supports and try 0.15mm layer height.

I higher collar height would be easy. This is only 6mm because of the clearance with the MDF grinder. Let me know if you would like a taller version.