This is a modification of Woofy's Spool Holder for loose filament:https://www.youmagine.com/designs/spool-holder-for-loose-filamentPrint 6 hooks and 6 arms from this design and add the modified Hub.You might want to print one or two spacers if you don't like how close the spool is from the wall (or where ever you fix it)This allows for the spool to be mounted on an alternative spool holder like lRobertl low friction spoolholder:https://www.youmagine.com/designs/low-friction-um2-spoolholderBare in mind that the loose filament holder is bigger than standard spools and that it won't fit the back of the UM2.