Essentially, a CO2 car is a block of material with four wheels attached and a hole in the back that can fit a CO2 canister. We would suggest that you source a suitable CO2 canister first in order to determine the diameter and the length of the hole but generally they can be around 9cm x 2cm. You will also need to construct a track, or rather have space to race them.
For more information please see our brief guide to 3D printed CO2 car projects.
Please note that to download as a guest you will need to enter a valid email address so that you can receive the download link.