I really like the “Joycon Knuckles” designed by Tokyotome. I used it every day for the past two weeks and it has been a great accessary for the game “Fit Boxing”.

However, one thing I find a bit pity is that when I put them aside, they simply just stay there. They do not stack properly or somehow combine. This leads me to the idea of making the “split & snap” version. 

For this build, you will need 10 6x3 magnets, which are easily available on Aliexpress. Just print two models and the magnets should be fitting into the indentations nicely. Pay attention to the polarity.

When you want to play fit boxing, just split them apart and they are the perfect joycon knuckles. When you want to play other games, snap them together and you get a proper controller. The snap form even benefit from the finger holes and feels quite comfortable.