This is a holder to clamp a Loc-Line style air blower / coolant hose to the X carriage. It connects to an NPT 1/4" pushfit connector on the other side.
I sourced the Loc-Line bits from RS (house brand). Thread design taken from polyScrewThread library by aubenc (http://www.thingiverse.com/thing:8796). You can easily replace the thread with something else using that library.
I printed mine in PLA (0.2 mm layers), with 50% infill for extra strength. Orient it upside-down (like in the provided .stl).
It fits nice and flush. The design leaves the on/off switch accessible if you are using the Dewalt router. You also need 3 M4x8 screws.