Material Update: someone recently tried to order this in aluminide material, and sadly it got stuck on the wall thickness check. This model is very much on the edge of printability with most plastic materials as well, but as you can see in the photo above it was printable in White Detail back in 2009-2010. If you wish to order one, please do so in some high-detail plastic material like White Detail or Ultra Detail. Thank you!
This is a little add to your keychain. It is in the shape of an engine piston with piston rod and bearing for a more unique look. Test print arrived, The piston head does rotate on the rod when ordered in white detail.