BQ (and general use) magnetic spool

need is a powerful engine :) i needed a spool holder that could fit any spool diameter, size, etc.... and didn't want to use cianocrylate or velcro to glues things on my printer, nor screws... solution.... NEODYMIUM MAGNETS. using 4 magnets (10mmx2mm) for each holder, i could fit every spool and in every position :)
hope you enjoy it