This is a "car" created with a 3-d printer in order to fullfil the objective of a prechallenge of my university group "UC3M Challenge - Mission: MARS". The prechallenge consist in making a "car" with the 3-d printer that is going to race in a 5 degree inclination ramp which is made of sandpaper.

I have used the marbel caster created by HipsterLogic, you can see it at the following adress: http://www.thingiverse.com/thing:8959 I only change the ball diameter by 17mm instead of 16.5mm in order to allow the marbel rotate freely. The other part of the "car" is a difference of cylinders which I design with openscad. This is not design in the best position for printing it. I complile the file with "replicatorg", and this program have a function that allow you to change the orientation of the element we are going to print. The one I used is the "mirror" reflecting in the z-axis. Onde I had all the pieces printed, I glued the parts using a hot melt glue gun. Hope you like it :)