So you love 3D printing your own toys? This OpenRC Formula 1 Car is worth a shot. It is a RC car that you can print in PLA with tires done in NinjaFlex. You are going to need brushless motors, battery, transmitter/receiver, and a few other components listed here to get started.
Of course, you can always use different materials to print your own custom RC car.
More info is available here.
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