This Turbine keychain consists out of two pieces. The case and the Turbine itself. You obviously need one of both pieces to make the keychain.
Mounting the Turbine is easy, just press it into the casing. A little lube will make the Turbine turn a lot smoother.
Also check out and print our Propeller keychain:
http://www.thingiverse.com/thing:494084
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