Rubber Spinner

My son and I have been making fidget spinners out of rubber. We use a 3d printed mold with a PLA skeleton suspended inside.

For the spin we use a skateboard bearing with a wooden dowel through it. Then we put TPU caps on the ends.

So, parts for this are:
- Skateboard bearing (cleaned/lubricated)
- Wooden dowel (8mm x 30mm long)
- Hot glue to seal the seam on the mold
- 30A silicone rubber (platinum cure)

And it needs both PLA and TPU (or something else to cap the dowel).

Whatever you cap the dowel with, make sure it presses in against the bearing to keep it from wobbling.

We printed everything at .8mm width and .4mm layer height on a .6mm nozzle. Hopefully it should work on other setups.

I made a short video about these spinners: https://youtu.be/9CUuZ-kEUHU

The file that ends with "MOD" is a modifier mesh for playing with slicer settings just within the outer rings of the skeleton. Check out the video for details.

The caps and the mold top STLs should be flipped for printing.

The mold cap is just a modified spacer with some alignment fins on it. It helps keep the dowel centered a little better than the earlier version in the photos.

Don't worry about getting rubber in the bearing. Once it cures it pulls right out, and the bearing just chews up any crumbs that get left and spits them out later.