Large Manual 3d Printer
Build in 'Other Style 3D Printers' published by Tom Kelly, Jul 1, 2015.
This is the largest printer I have found. It is also the cheapest. The reason is that it is run by hand, without computer or motors or electronics. Put an object on one side and move the 3d pen while tracing the object. Move the z dimension by turning the crank on the lab jack to move the printed copy down a notch. Be creative!