If you have an Eureka coffee grinder you know the mess outside the portafilter when grinding. This funnel helps to minimise the spill and has been designed for a 58mm portafilter. It might fit also for other mills.
Fusion360 CAD file is provided for own modifications.
Siebtraeger_Trichter.f3d | 137.5KB | |
Siebtraeger_Trichter.stl | 837.9KB |