Abstract: A multi-section grinder includes a grinder section, a filter section, and a collection section. The filter section has a photo-etched stainless steel filter including a stainless steel sheet, a plurality of photo-etched apertures defining openings through the stainless steel sheet, and opposing tabs extending from a periphery of the stainless steel sheet. The grinder section, the filter section, and the collection section are releasably connected to each other with a non-rotating magnetic coupling. Each coupling has a first non-circular peripheral wall on a first section including a first plurality of peripheral magnetic elements and a second non-circular peripheral wall on a second section defining a non-circular peripheral recess.