Summary This is a simple universal spool holder that will hold most spools up to 2-7/8" wide. It uses standard 608 bearings (skateboard bearings) and stainless 5/16" tube cut to size. Instead of typically having rollers over bearings supported by axles, this uses the axles as the rollers themselves, which are supported by the bearings. (Saves on having to purchase tubes for the rollers.) Prints without supports. PLA works fine. Print Settings Rafts: Doesn't Matter Supports: No Infill: 20% minimum