Note - Sept 21,  2017 newer 4.1 version uploaded. some minor additions and screws/nuts added to maintain grip on the bearings as I've notice over time the printed plastic all seem to loosen up and release the bearing. 

Summary lightly remodeled the stock Max Micron X carriage to included an adjustable end stop and actually raised the mounting a few millimeters giving not only a tad more build able height but more to get a much better/straighter belt path. you'll need to add a nut and bolt/screw I highly recommend gluing the nut in place