Customizable spool holder, default values are for the Prusa xi3 Look at the instructions to see how to setup the spool holder. Keep in mind that even if this is a customizable design you need to keep all values on a reasonable level or it will cause problems. !! I did not verify the strength of the holder with all different values. I do not know how it will react with the weight of a spool. YOU ARE USING THIS DESIGN AT YOUR OWN RISKS !!Print 2 of the spool holders. Find a rod to support your spool. Put your spool on the rod and put the rod onto the 2 holders mounted on your 3D printer frame.