Here I'll build a module that can be rotated by hand and easily attached or removed from the conveyor belt assembly.

Start by attaching the bin base to the conveyor belt board using four #6 x 3/4 inch wood screws.

Next, print the "bearing bottom" piece.

Insert the bearing.

Add the bearing top to the bearing assembly. The top piece has no screw threads in the outer holes.

Secure the assembly by screwing the two bolts into the end holes.

Print the bin spin combo and bring it to the bearing assembly.

Press the "bin spin combo" into the bearing assembly.

Bring the "gear lock" to this assembly and screw it into the bottom of the "bin spin combo."

Attach the "module attach" piece to the above combo. I melt them together using a soldering iron, though I suppose they could be glued.

The completed module, from the top, looks like this.

The module can be easily screwed onto or off of the conveyor belt base.