About this 3D model
Ever since I got my P1P, the back mounted spool holder has been an annoyance, so I designed this simple side mounted spool holder. It hooks onto the side of the frame and pops into a small hole. You should be able to push down on it once hooked until the small bump on the back of the model fits into the hole in the printer frame. The bottom hook snaps around the frame to hold it in place firmly. No supports are needed and it shouldn't need a high infill - 5% works fine. I printed this in PLA Pro, but normal PLA should work, although make sure the filament can bend a bit and isn't too brittle. I printed this in around 30 minutes (assuming you are using the P1P).