Yubico Yubikey Neo Cover

If you have a Yubico Yubikey Neo, Standard, or U2F key as pictured https://www.yubico.com/products/yubikey-hardware/ -- this is a cover that will allow you to keep the Yubikey on your key chain while also protecting it from scratches, dings, and stress. It slips over the Yubikey and allows the key to be pulled or pushed out only with direct force from one of two directions.

I have included the STL and SKP files for your own modification.