Printrbot Dual Extruder Carriage and Mount V2 for Linear Bearings

This is a new version of my "Printrbot Dual Extruder Carriage and Mount" but uses Linear Bushings on the original axis-es rather than the Pillow Bushings. 1 Pillow Bushing is still required for under the mount for the new axis.

Use this with my X Axis 3 rod addons.