3D printing and building an RC car differential

After a thorough redesign of the rear axles whereby I coupled the rear two differentials directly through an extra pinion I've now come to the point that the engineering part of the rear of my RC car project is finished. I finally found time to assemble the rear two differentials, I filmed the build of the most rear differential and off camera I also built the second rear axle and differential. This clip is part one of building the differentials, in part two I'll be adding the independent suspension and wheels to it.