Future hardware revisions.
As we move forward with the launch of the model 2.0, I think we should discuss how we will handle future improvements and refinements to the hardware. Developing and distributing new hardware versions is capital and labor intensive, and should not be done lightly.
I think each part of the printer should have a separate version and milestones and be tracked as separate developments. For instance we could have Chassis 2.0, 2.1, etc and Displacement tool v2.0, 2.1, etc. these would be developed and released at different times. a Model 2 would simply be an assembly of any version 2.X components. This would differ significantly from the Makerbot method where every batch has a unique combination of chassis, tools and electronics.
As we move forward we should view Chassis, electronics, tools and software in separate threads developed under the Fab@Home project.