Type A Machines Series 1 and U-T-O-M dual extruder x carriage for QU-BD or dual MK7

Same as the single extruder version, but properly spaced for dual MK7s and any clones such as QU-BDs.

The cheap way to add dual extruders.

BTW, the key here is this mount exactly follows MakerBot's dual extruder mounting spacing for both T-O-M dual MK7s and the Replicator. This in theory solves a lot of the offset issues with dual extruders by following a known example.rather than some arbitrary standard.