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Sorry to hear that! Did you 3D print the bottom plate? It's sized so that it needs to be laser cut or the fittings will be very tight. I'll work on a 3D printed version tonight to fix that though. I'm not sure what happened with the rear gear though. I would check that everything is tight and you are using the right size pinion gear. If even one of the motor screws are lose, the rear gear will grind down quickly. I've owned my version of this car for over six months and have only had to replace the steering servo a few times after hard crashes. Additionally, we guided almost 20 6-12 graders to build these thing last summer and never had any problems with the fittings or gears over the course of the week. What filament are you printing with? The tolerances on this car are such that it's ideal to print in PLA.