I took the original model, reduced it and added a ring for a keychain rope.
I chose ABS for its heat resistance and for testing and I liked the result, any other material should have no problem. A small nozzle is recommended for more detail.

This size will let toy print up to 27 pieces at the same time (256x256 mm printer size), all that amount with the previus configuration in a P1S takes around 14h.

The original model is really good and detailed on it's own.