I had already done a SNES Controller Keychain, so I figured I might as well do an original NES controller as well.
Components are sorted into colors, with Light Gray being the body, black being the directional pad, the select/start buttons, and the decorative inlay. The A/B buttons are Red, and there's a series of darker gray strips to complement the black inlay. (Although I had no dark gray filament, so I just used acrylic paint)
It all gets glued together. Print with supports for the keyring tab, and 30% infill.