Mousetrap Car

thingiverse

This mousetrap car can be almost entirely 3d printed other than the axles and bearings, and mousetrap of course. It was inspired by a Mark Rober video where someone also used a pulley design. This car goes extremely slowly but can travel long distances. The bearings used are airsoft bearings and the axles are 2.9mm brass rod from ace hardware. Most parts should only take light sanding in the axle holes to get a snug fit. There are three options for wheels, a set of adaptors that allows the use of CD wheels, a fully printed wheel, and a printed wheel that fits 6mm axles. The chassis is printed in two parts and is then clipped together with a bit of glue in the joint. the bearings can then be press fit into the six housings and spacers then used to keep everything in the correct position on the axles. The mousetrap can be cut down and then slid into the back chassis. The string must be would around the front axle and then tied to the pulley clip that is then slid through the hole in the side of the pulley and locked into place. A second string is then tied to the pulleys axle and wrapped around before being tied to the end of the mousetraps lever arm. This arm can be extended like it is in the picture with a piece of brass tubing.