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An odd question, but... How do these work? I have 3mm diameter by 3mm high neodymium magnets already that stick to my snips, vernier, ruler... VERY well, but I can't get it to attach to the motor spindle on my Prusa MK3 (using a regular NEMA17). The magnet wants to stick to the casing more than the spindle. I have an 8mm extrusion that the magnet sits inside and just a bit proud so it should centralize on the spindle and have support around so it doesn't move, yet enough clearance to spin freely in the hole.. but then the visualiser still won't spin. My only other thought is that the 8mm magnets are actually controlled by the magnetic field caused by the motor actually moving and not the spindle... especially since looking closely the spindle doesn't seem to stick up clear of the housing too much, and if I attach the magnet to the motor alone, it sticks to the edge but does rotate. If I have to order the 8mm magnets then fine, but I'd like to understand why :) Thanks