Tri-Spinner With Ridges

Here is a remix of 2ROBOTGUY's Tri Fidget Spinner Toy. I took his design and added two elements: ridges on the edges for added traction and little bumps on the inside to help hold the bearings in place. I also moved the caps to print inside the spinner's empty space to try to save filament by reducing the area of the raft. This is my first object I've posted on Thingiverse.
The image actually contains parts from two different prints. I printed 4 spinners in black and 4 spinners in yellow and then swapped the bearing caps so all of the completed spinners have both yellow and black.