Chris Fenton has outdone himself with another 3D-printed mechanical computer, called the Turbo Entabulator, a followup to the 3D-printed FIBIAC. The Entabulator is completely made of 3D-printed parts using a MakerBot Thing-o-Matic, with the exception of some nuts and bolts, springs, and bearings. His idea is to build something that is completely mechanical, using levers and gears instead of smart electronic components. He has produced what he calls a "reliable, 3-D printable10-hook punch card reader." Anyone interested, who has the capability to 3D print can download the files from Thingiverse and have a go at building their own mechanical computer. more details on this project here: http://3dprint.com/16795/3d-printed-computer/

Check out a picture of the finalized 3D printed computer: