Print the original Nittany Lion Head with a negative primitive to make a 10mm x 10mm x 10mm cylindrical cut out.
Print the Keychain plug separately. Print standing up with a brim. 3 wall minimum and good infill.
Glue in place.
Thanks natere703 for creating the main model.
https://www.printables.com/@natere703_248417
https://www.printables.com/model/236644-nittany-lion-head-collection
The author remixed this model.
Adaptation to make a Nittany Lion Head keychain.