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I ordered the pinion on the list. Regardless, the gear tooth size is small enough that .1-.2 mm variation in center to center distance (3d printer variance) would reduce engagement. My first gear stripped before the car traveled one foot; this prompted me to look closer.

Just sayin’. Some adjustment might help some builders. I noticed you mentioned having extra gears printed for the class since they do wear out after a while.

This project has been fun!