Here's the fully working new 2x12 RC (latest model) on the DE website that I'm selling. You can't get this from Technobots (they seem to have the older model).
http://www.dimensionengineering.com/pro ... ooth2x12rc

And I'm including my faulty 2x12 (latest model):
http://www.dimensionengineering.com/pro ... rtooth2x12

This also isn't available on the Technobots site. Both are directly from Dimension Engineering, and pass UK customs, the build lead time and all that hassle.