This is a holder for inductive sensor LJ12A3-4-Z/BY, to fix the sensor on your Hephestos Prusa i3. This is a verry stif holder which is fixed behind the fan. Also available for sensor LJ18A3-8-Z/BX. (http://www.thingiverse.com/thing:1429280)
Best way to print this part is straid up, but you have to use support.
Designed with Cubify Design.