Birds are nesting in my R2 ?

@Trevor C there appears to a be a bit of binding. it is likely your gantry is not as square as it should be. Dig out those four orange clips that your R2 shipped with and clip them in place with the extruder in diagonal corners. at each corner loosen the set screws on the pulley gears that move the gantry and flick or plug them like a guitar string. This should make sure the gantry in that corner is square. remove the clips and go to the opposite corner and do the same thing. That should pretty much guarantee that the gantry is square and that there is no binding.