by thedoctor, published
This piston has a cylinder head, so it can be powered on the up and down stroke. Another entry for the Makerbot giveaway.
As with my other piston, you will need to split the document into two, the cylinder, and the piston rod. the piston rod half also indludes the cylinder head. use a file and a pair of calipers to get a snug fit. Next, drill four small holes through the cylinder head into the wall of the cylinder, so it can be screwed on. slot the piston rod into the cylinder befor screwing the cylinder head on.