This a small Print-In-Place Turbo Charger Keychain for the other car lovers out there. Roughing based on a T3 Ebay turbo. The Knob Requires a nice strong turn to break the internal points of contact on a fresh print, but then should spin freely. File is set at the smallest possible size I was able to reliably print, feel free to scale up with good results (I've tested up to 500%) but scale down at your own risk~