This is a filament top mount for the Kossel Mini. Changed the holes slightly to allow it to be more adjustable when mounting. Also customized it for the bearing found in old Maxtor harddrives and a spool with 38mm inner diameter or more. Much creds to elmuchacho here at Thingiverse for the original design which I just modified slightly to fit my needs. Update: Added a simple adaptor-plate for 52mm spools, to put on top of the other when needed.Remove the bearing from an old harddrive (Look on Youtube how to do this). Push the bearing into the top, leave 1mm to make it spin without friction. Printed and tested with my Kossel mini, fits very nicely on top and spins incredibly easy.