All you need is two of these brackets and a length of 1/2 pex water line to build this filament sample holder. Works great for holding and feeding small filament coils into your printer. I needed something to hold a couple of sample coils of proto-pasta and printrbot filament. Fits 25mm or .099 inch thick shelf,s. Mine happen to be from Ikea. 50% infill .15mm layer height 60 mm/s pla @ 208c no support I used a raft might not be needed