Rubber Band Wind-Up Car

thingiverse

This is a 3D printed car that winds up using a rubber band. All the parts are printed except for the rubber band. There are several bearings that have been designed into the parts. Airsoft bb's are used for the balls in the bearings. Once it is printed, just pop the airsoft bb's through the hole that's meant for them. In total, you'll need twelve 6mm airsoft bb's per bearing. It will take a bit of force to get the bb's through the hole. That is intentional so that they don't come out. To make it spin even better, you can lubricate it. I just sprayed some WD-40 into mine and it made a huge difference! Let me know if you have any questions.