Nice little bullet keychain. I didn't print it yet, but I'm planning to do so soon. When I've printed the keychain, I will post some photos of it of course.

I would print it with .2 layer height and about 30% infill. I think with some supports at the underside, it will be pretty easy to print the keychain. For the top, I recommend using a minimum layer time in order to get a sharp tip.

Anyways I would REEAALY like it if you would share some photos, if you've 3d-printed it!

I wish you good luck! :-)