Adjustable Delta 2020 profile opto endstop mount

To my surprise I couldn't find an adjustable opto endstop mount for a 2020 profile extrusion suitable for a new large format delta I was building, so here it is. Uses M3 hardware and soft springs to create a high(er) precision adjustable opto endstop mount.

The mount is setup to work with the very excellent magnetic carriage designed by jartz as can be seen in the photo, link to the carriage at http://www.thingiverse.com/thing:1064124