However, when this was all assembled, the car was too heavy to climb walls or stick to the ceiling. Thus, a weight-saving plan was in order. Wheels were swapped out for lighter 3D printed parts.

If he had a super smooth ceiling, sure, he could suck himself to it, but this is more robust. Blowing usually works better. Turn a fan on. Do you feel more air/thrust in front of the fan or behind it?