Mostly Printed CNC Optical End Stop Mount

> UPDATE Dec 3 2016: My end stop cracked where the bolt tightened onto the conduit, so I made an updated version that is thicker and stronger. Also fixed a problem with the IE version where the bolt hole was in the wrong position.

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>NOTE FOR MPCNC 525: This was designed to support the original MPCNC. I expect the end stop holders themselves to work fine on the 525, but the light barriers likely don't mount on the new design. I plan on upgrading my MPCNC and plan to update this design once I have the CNC working.

Remixed Allted's end stop mount for the Mostly Printed CNC to work with an optical end stop. This design has two end stop sizes, one for X and one for Y ("Short" and "Long"). I place these on the outer rails instead of the moving X and Y to keep the wires from moving. There is also a small opening to allow for a wire wrap to help keep the wires clean. These are clamped on with the same #6-32 3/4" bolt and nut that are commonly used in the MPCNC. Note t