Conical filament spool bearing using BB bullet 50-60

thingiverse

This is a ball bearing designed to fit filament spools with an inner diameter of 50 mm to 60 mm. The inner diameter of the bearing itself is 8 mm, and its outer periphery is conical in shape. To prepare this bearing, BB bullets are needed separately. To assemble the bearing, divide the inner frame into two parts. Insert a higher frame inside the outer frame, fill it with BB bullets, and fit the lower inner frame in place. It's crucial to ensure that the core rod at the center is securely fastened, as a loose rod may cause the bearing to come off. To prevent this, we've added a ring to keep the bearing from slipping out. This design was created based on Daneelg's suggestions, and I'm grateful for his valuable input.