Knuckle Roller kiểu Knucklebone (không cần support)

There was no easy-to-print version of the knucklebone toy, that had the same shape as the original, so I remixed a model to make it print in one part.

Toy works by just throwing it in your slicer and printing at ~20% Infill
If you want to make the ends heavier, feel free to use modifiers and increase the infill in the ends (I did mine at 100%)