In your Kickstarter description, you mentioned that the machine would be upgradeable from the single extruder to the dual extruder. Just wanted to know if that was still part of the design and are you planning on making this upgrade available sometime after the first version from Kickstarter is finished? I have a single head Zim, and was just curious how patient I should be for the dual upgrade.
Upgradeable print head?
Also a good question would be, is it too late to upgrade your reward to the dual head now before your Zim ships… 
That might be a better way to go. I would send them an email through kickstarter on that question as well.