Simple Budget RC Car (Easy to Print & Assemble)

###Overview This is a fully 3D-printable RC car engineered to prove that great performance doesn’t require expensive components. While most RC projects rely on high-end brushless systems, this platform is designed specifically around the standard 280-size DC motor (2mm axle) – a motor that is affordable, accessible, and perfect for indoor engineering projects. With a total length of 300mm, the car features a robust and elongated wheelbase, providing stability and a sleek silhouette. Since the 280-motor is traditionally "weak" for a vehicle of this size, the heart of this project is a custom-designed two-stage gearbox. ###Technical Specifications Drivetrain: Two-stage internal gearbox with a 1:25 reduction ratio. Motor Compatibility: Optimized for 280-size brushed motors, but the chassis is designed to be easily modifiable for various powerplants. Chassis: Rigid-frame construction (no shocks) optimized for smooth indoor surfaces and low-friction environments. Scale: Large-format indoor cruiser (300mm length). ###The Engineering Solution The challenge was to generate sufficient torque from a low-power motor. By implementing a 1:25 gear reduction, the RC Car achieves a perfect balance between controllable indoor speeds and enough "grunt" to navigate carpets and minor obstacles. This makes it an ideal educational project for understanding mechanical advantage and gear ratios. ###Assembly Instructions To ensure a successful build, follow these steps: Gearbox & Motor: Start by seating the motor in the chassis. For the most reliable power transfer, use a small amount of high-strength adhesive (epoxy or superglue) to secure the motor once the gear mesh is perfectly aligned. Drivetrain: Ensure all 3D-printed gears are cleaned of any support material. A small drop of plastic-safe lubricant on the gear teeth will significantly increase efficiency and reduce noise. Hardware: The rest of the assembly uses a standard bolt-and-nut system. This ensures the car is easy to maintain, repair, and upgrade as you iterate on the design. Tires: For the best grip on indoor floors, I recommend printing the tires in TPU (flexible filament), though PLA works fine for drifting on wooden surfaces.