These are newly designed and modified parts for the Apollo Crawler Truck by https://www.printables.com/social/352355-bglasford1.
Both the truck’s Face and Back plates and the two inside section Parts 1 & 2 have being redesigned to accommodate the newly designed Drive Sprockets and Idle and Tensioner supports and wheels. All which are now working models.
Also added further detail to the Motor Truck Gears and the motor disc and modified the Air Duct Duct part to attach better to the Motor Truck Gear.
All to enhance the great model by Bill Glasford.
The author remixed this model.