This is yet another spool holder, compatible with Ultimaker original. It uses 2x 8x16x5 bearings, M8x150 mm bolt and some printed parts. By printing 2 sets of cone centering parts, you will be able to use it for 2 type of reels: narrow reels with ID up to 70 mm and wide reels with ID 50 mm. I found these two common types of spools when ordering plastic from European suppliers.Check BOM for parts list.