Over-Engineering an FDM Spool Holder From Prusa Mk4S Remains

A Prusa Mk4S user built a custom top-mounted spool holder after converting to a Core One. The holder features a flippy lid with a rail that slides out for magnetic spool attachment. It stacks on top of the printer and adapts to different spool sizes. The design fits in confined spaces and improves access when side mounting is blocked.