Dual extrusion carriage for Repemaker.(2 j-head hotends)

Dual extrusion carriage for Repemaker 3d printer. For j-head hotend.
A update for Repemaker 3d printer http://www.thingiverse.com/thing:138063
Here you can view the new version (not update yet)
http://www.youtube.com/watch?v=OfbQ5YGW0K4