Download video: 3D Printing - Combining NinjaFlex & ABS with dual X Carriage
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With two extruder carriages the inactive extruder can be parked and the nozzle blocked to prevent leaking. This greatly improves on the finish quality and reduces cleanup. Normally there is no need for a purge tower, unless an extruder is going to be inactive for a longer time (in this case for the first 100 layers).
For questions about the printer i'm using please PM me or write a comment below. The printer was my summer project and it will be made opensource later this year (probably under the name EcktiveDuo)
PS: Thanks to all the marlin firmware developers for implementing the dual X carriage feature!