The motor behind it all is a geared stepper motor, and there are a set of printed parts to complete the model.

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Still, those are pretty minor gripes. The quad-motor Rivian R1T and R1S look great, go like hell, and can handle some serious off-roading.

Rivian owners may remember that the first-generation R1 models were available with a Quad-Motor setup that produced 835 horsepower. Since the Tri-Motor models now deliver 850 hp, clearly the Quad ...

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