Here is a blank keychain fow whatever you need! Want keychains for yourself? No problem! Keychain for you client? Go ahead and download STEP and edit it yourself!
Keychain have rotating center and swivel on the loop. It is designed in a way to use no support at all. You will only have to break the swivel free and you are good to go!
In print settings you can find 1 piece plate as well as 28 pieces at one go!
Enjoy and do not forget to share what logos you put on the keychain in the comments!
EDIT:
Added NFC keychain with place in the middle for NFC tag of 25mm diameter and 0,3mm thickness