This could become a standard feature in the near future ...
Advantages of separate x-carriages:
- The inactive extruder can be parked when not in use.
- The inactive extruder can be easily capped when parked to prevent runout / ooze (which makes restarting the print more accurate).
- Each x-carriage is almost half the weight which allows higher print speeds with less backlash.
- The x-carriages can duplicate one another allow two copies of an object to be printed at one.
Demonstration of duplication mode:
Instructions, more information and downloads: