Folger i3 2020 Z-Axis Induction Sensor and Fan Bracket

Bracket to hold a cooling fan (See Thing: http://www.thingiverse.com/thing:1161013 for the fan shroud) and inductive sensor on my Folger 2020 Prusa i3.

OpenSCAD file included but requires the .stl from: http://www.thingiverse.com/thing:1161013

Added new .STL and OpenSCAD files for an 18mm version. One about the same as the original 12mm but pulled in as close to the printhead as I could get it. And a second version I haven't printed yet with the ring pulled back in the Y axis so it will