I want to introduce you to my key rings collection with both functional (can be opened/closed) and closed rings. Use the closed rings as “starter” and the smaller “functional” rings to insert key, keychain accessories or else. 

Complete by getting keychain accessories like:

 - my blank keychain for marking the key or adding a phone number in case you lose it:

- a Blackbird SR-71 Keychain

- my 2 in 1 cart key for unlocking shopping carts and additionally opening incoming boxes:

- a cute (and spooky) cat keychain     or a     piggy queen keychain

- anything from the Printables Key Tags, Caps & Identifiers Contest where the rings can be used to complete a model and make it ready for your existing keychain

- if you need a key tray, for example get this one:

Print Settings

· easy to print - no supports needed when you have a reasonable print bed adhesion

· choose a layer height less than the usual 0.2 mm for good resolution of the round surfaces

· print with 100% infill and concentric fill pattern