bondtech bmg extruder carriage robo R1+

2/7/18 UPDATE,
i have made changes to improve the vertical rigidness that was causing issue during the 9 point level and throwing off the z offset in an unpredictable manner. the unit now has a removable plate to make it easier to remove the hotend and extruder assembly, a beefier cable harness that wont crack as easily and easier access to the bottom right mounting screw through an opening in the belt tensioning platform
any feed back is appreciated to help make more imporvments