Fidget Finger Massager 2000!

I love climbing and the day after a hard session my fingers are always achy, so I decided to design this fidget finger massager to help. Inspired by the common acupuncture ring, I started with a basic open ring design, but soon realised that if I wanted constant pressure on all sides of the fingers I had to go for a much more complex design. Someone might say this is overcomplicated, but I absolutely loved the iterative design process that led to this final version!

The rollers must be printed vertically to ensure strength in the axis, the rods must be printed with the long side horizontal and the ring with the holes facing up (or just use the profile provided). The rollers are a very challenging part to design and I had a few failures while working on it, but this latest version seems to be more stable. Anyway, I always print 9 rollers instead of 8 so that I have a spare one in case of failure (and same for the rods).

In the profile I included 3 different plates for the rollers: a hexagonal version with bumps, a hexagonal version without bumps and a round version with bumps. The model in the pictures refers to the hexagonal version with bumps.

As for the assembly, simply slot the rods into the rollers, then slot them again onto the ring. I used a drop of superglue (CA) on the ring side to make sure they don't come off. I tried to make tolerances tighter to have a friction fit but assembly becomes a lot more difficult and there are more chances or snapping the rods, so just use superglue :)