Design

This fidget has similar characteristics to a butterfly knife, but in a simple, smooth, and forgiving package. It's designed to print in place with zero supports, and has two weight options depending on how “slingey” you want it to be. 

Printing

Resolution: .2mm

Walls/Perimeters: 3-4

Infill: 20%

Supports: nope

Weights

Some weight is required to give the Finger Slinger momentum, so there are two options. 

1. Printed Weight: A cool looking insert that provides great balance and agility. (print at 100% infill) 

1. Skateboard Bearing: For insane performance and crazy speed, a 22x7x8mm bearing can be used. 

Freeing the Fidget

To break the model loose, follow these steps: 

*don't be afraid to use a bit of force

First, give it a slight bend until the arms pop away from each other:

Then push the top arm out to free the bearing:

Notes

Both weight options should press fit nicely into the top arm, but a little glue isn't a bad idea if they seem loose. 

Scaling: My hands are on the bigger side, so the fidget may be a little large for some people. If you need to scale it up or down, +/- 20% is the threshold before tolerances get messy. 

I'd love to hear feedback on this design and continue developing it, so let me know what you think!