This is the 3d Print .STL for Klefki and two of the keys on it's body - car and futuristic. I made this model myself and am very proud of it; the body and key are separate for ease of print and can easily be glued together using Gorilla Glue (my personal favourite!). The hole is more than long enough, so there is no problem there. There is a second hole in the key shaft for the metal ring. This is 3/8in round, and will fit a "Rule your Rulers" (JoAnn's) ring perfectly, but if you prefer, you can un-group the hole from the shaft and remove it or alter it.
The rest is painstakingly modeled and sized carefully by my and the proportions were very carefully created, but they are not locked if you so choose to alter them.
I recommend using white Plastidip as a base coat and then carefully using a silver spray paint on the back of the body and key shaft and a pink on the teardrop. Then, you can go in with acrylic to finish the details - holographic and enamel metallic silver work very well here.
Enjoy, and don't forget to check out my pokepuff listing! My Keychain likes the two-toned purple frosted one best.