Piezo disk bed leveling for 3D printers

Although there are many types of detectors for leveling the build stage of a 3D printer one, the method developed by Njål Brekke which is detailed at http://www.thingiverse.com/thing:707392 has the potential to be amongst the most accurate and robust as well as potentially the cheapest. This design attempts to improve the sensitivity of the Piezo disk sensors.

A PDF file in the Thing Files includes a description of the method along with design and constructional details, and a schematic and g