Bearing Parts

Gather up the 3D printed parts and hardware needed to build the bearing. Use the following hardware to assemble the bearing.

• 4x M3 x 12mm long machine screws
• 4x M3 hex nuts
• 16x 5mm diameter steel balls

Install Bottom Hub

Begin by orienting the BB Outer Bezel part with the flat printed surface facing up.

Place the BB Bottom Hub part inside the BB Outer Bezel with the wider surface facing down. 

Install Ball Insert

Locate the thicker edge of the BB Insert part and lay it face down in between the BB Bottom Hub and BB Outer Bezel parts. 

Install Steel Balls

Begin inserting the 5mm diameter steel balls so they are fitted into the holes in the BB insert part. Slightly (and gently) lift the BB Outer Bezel part to allow the steel balls to sit inside the groves.

Install Top Hub

Place the BB Top Hub part over the BB Bottom Hub with the hexagon recesses facing up.

Flip Bearing

Carefully slide the bearing assembly to the edge of the work surface to allow handling the top and bottom hubs. 

Keep the top and bottom hubs together and then flip the assembly over. Keep the assembly in hand to allow adding hex nuts and screws.

Secure Bearing Hubs

With the bearing assembly in hand, insert four M3 hex nuts into the hexagon recesses on the top hub. Skip a hole with each hex nut.

Then, insert the four M3 x 12mm long machine screws to the corresponding hex nuts. 

Fasten the machine screws until they're fully tightened with the acommpanying hex nut. 

Assembled Bearing

Take a moment to ensure the bearing is fully secured. The BB Outer Bezel should free spin independently from the internal hub assembly.

Install Bearing Gear

Orient the Slipring Gear part so it matches the assembly photo. The orientation of the helical gear teeth must be in the correct orientation.

Line up the Slipring Gear with the BB Outer Bezel so the notches are matching.

Press the two parts together until they are flush. The fit should be snug and tight.