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I really liked the tiny bit driver. It is really functional and doesn't take much space at all. However, its size made it hard to find when i needed it so i made a simple keychain version. The hole is a tiny bit tighter to prevent bits from falling out while carrying so i recommend scaling the model to 101% or 102% if you want to be able to change bits easily.
I will add the magnetic version in the future if there is demand for it.
The author remixed this model.
Added a small hole to one side of the original model. The hole should be big enough to fit thicker keychains as well but let me know if you need a version with a bigger/different shape hole.