Wall Mount Spool Holder with Bearings

thingiverse

I designed a spool holder that uses spare parts from past projects to minimize waste. This over-engineered wall mount utilizes 608zz bearings and 8mm rods with M3 and M4 screws. When the printer pulls filament, the rollers spin smoothly on heavier or fuller spools. I built this design to avoid surface artifacts on prints caused by mounting spools directly on the printer frame. The holder includes three different wall mounts: one open for rod passage, one closed on the right, and one closed on the left. Due to ducting in the wall, I used two open hole wall mounts since my studs are spaced 8 inches apart behind my printer. A 95mm roller is included for standard spool sizes, while a 130mm roller accommodates almost any spool size. The photo shows the larger rollers. Tiny supports on the bottom inside of the roller provide a cleaner print, but I didn't use them and still got a nice fit. Roller guides are designed to fit snugly on 608zz bearings that also fit well on 8mm rods. However, I discovered that two different brands of spare bearings have varying sizes. If you use this design, test one roller print first to ensure the bearing fits properly. You may need to adjust the model size by 1-2% if it's too loose or tight. The roller guides clamp onto M4 screw holes to keep spools in place when the rollers spin. One guide file is tight, while the other has over 1.5mm tolerance due to differences in PLA and PETG filament shrinkage. Little circular clamps with M3 screw holes hold 8mm rods in place, even if things fit snugly. These clamps are not essential but useful for keeping spare spools from sliding off at rod ends. I used around 50% infill on wall mounts, 75% on rollers, and 100% infill on small parts to make screw threads reusable. Feel free to remix or improve this design, as it was created mostly in Tinkercad with some elements designed in Fusion 360 for higher resolution roundness.