Could you get a 58-51mm step down dosing ring/funnel machined/3d printed? Not hugely complex. I did a quick google, surprised it doesn’t already exist.
Yeah there's a few 51mm funnels around, probably just going to pick up one of those o grind straight into the portafilter. Not exactly the worst problem to have and given the vast majority of owners will be using a 58mm portafilter I'm not surprised that's the only option shipped with the grinder!
Could you get a 58-51mm step down dosing ring/funnel machined/3d printed? Not hugely complex. I did a quick google, surprised it doesn’t already exist.