This is a hook I designed and printed to hook my spools on a bar for a huge, sealed enclosure I made for my printers and filaments... The project is pretty awesome, check it out...Pages of the project:https://www.youmagine.com/designs/my-awesome-printer-enclosure-maker-space-with-all-print-fileshttp://www.thingiverse.com/thing:748679Youtube video of the project:https://www.youtube.com/watch?v=9QS96e30AoE