This is a wall mounted universal spool holder. The design uses two cones that are tightened by a threaded rod to fit most spools. Bearings are used for the cones to achieve very smooth filament feeding. The cone holder is attached to a mount that can be attached to most walls using plastic anchors. The hardware required is relatively inexpensive and can be purchased for about $10 (US). I chose this design because I wanted a universal spool holder and something that would not clutter my already small desk. Since my 3D printer is too small to have a frame mounted spool holder and I do not plan on moving my printer anywhere else, I chose to mount it on the wall. The spool I am using is a 1 kg roll of PETG and the mount has no trouble supporting it. The bearings provide smooth feeding and I have not had any issues so far.