Ender 3 Spool Bearing Holder - Fast Print, MR105 5x10x4 Bearings

thingiverse

This Ender 3 modification enables the filament spool to turn freely without any drag. This version 3 is a redesign that solves both problems of the previous one. The stress on the ring has been eliminated by using a set screw to secure the ring to the tube. The plastic post that held the bearing hub has been replaced with an M5 screw supported on both ends, ensuring that the weight of the filament spool does not deform the assembly. It works by supporting two MR105 (5x10x4) ball bearings above the factory 32mm O.D. spool holder tube, making it very easy to print, install, and requiring minimal filament. PETG is recommended; PLA should work fine, but ABS is not recommended unless you are able and willing to compensate for the shrinking. Because the ball bearings will elevate the hub of the filament spool, the factory tube nut will no longer be tall enough to prevent the spool from sliding off the end of the tube, which is why the Spool Disc part is needed. Printed parts: (2) Bearing Mount Part A (2) Bearing Mount Part B (1) Spool Disc Hardware Required: (2) MR105 ball bearings (5mm I.D. x 10mm O.D. x 4mm width) (2) M3 x 8mm screws (2) M3 hex nuts (2) M5 x 20mm screws (2) M5 hex nuts (nylon insert nuts would be best if you have them) Installation: 1. Remove the end nut from the factory tube. 2. Insert the M3 nut into the Bearing Mount Part A (there is a hexagonal cutout on the inside of the ring). 3. Put the M3 set screw into the hole so that it engages with the nut, but not far enough to protrude inside the ring. 4. Insert the M5 screw through the hole in the Bearing Mount Part A to become the "axle" for the bearing. Place the ball bearing over the M5 screw. 5. Slide Bearing Mount Part B over the M5 screw so the posts line up with the posts in Part A. 6. Add the M5 hex nut to the end of the screw. Make snug, but do not over tighten. A nylon core nut would work best if you have one, since no clamping force is needed. The nut is just there to keep the screw in place as an axle for the bearing. 7. Repeat steps 2 through 6 for the second assembly. 8. Slide the bearing mount assemblies over the factory spool holder tube with the bearing at the very top of the tube. 9. Tighten the M3 screws (as set screws) until the assemblies are secured to the tube. 10. Slide the disc over the end threads of the tube with the large portion on the top. 11. Reinstall the factory nut on the end of the tube, securing the disc in position.