A different multi-extrusion approach - UM tool / printhead changer in Modifications, third party add-ons & other hardware Posted December 8, 2016 Hi @foehnsturm, Two questions about the magnets: In Canada it is harder to find exact metric sizes for magnets (or anything else it seems! :() than imperial/American/standard/whatever. My math says 1/4 inch is 6.35mm and 1/8 inch is 3.175mm. Would 6.35mm x 3.175mm magnets fit your design? Are they close enough for tolerances, etc.? ... Or should I actually push for precise metric dimensions. Also, how important is the quality of the magnets. Your link, for example says N45. Would N35 be okay or too weak maybe? Would N48 be okay or too strong maybe? I don't know magnets or your tolerances, so I am just trying to figure out strict I need to be with the specs. Anyway, thanks very much!