This is a mount for the BL / 3D touch bed leveling sensor that replaces the cap for the E3D print head. The sensor is mounted 30 mm to the right of the nozzle. The mount fits under the drag chain mounting bracket (http://www.thingiverse.com/thing:2105040). The holes to attach the sensor have threads printed into them to accept M3 screws so nuts should not be necessary. The threads come out better when printed with 0.1 mm resolution.

Offsets that you need to change in the Firmware:
define X_PROBE_OFFSET_FROM_EXTRUDER 30 // X offset: -left +right [of the nozzle]
define Y_PROBE_OFFSET_FROM_EXTRUDER 0 // Y offset: -front +behind [the nozzle]
Adjust your z-offset according to your first layer.