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Fixed parts are ready. See http://www.thingiverse.com/thing:981794 use them instead of the parts uploaded here.

For your motors use Extruder_Rev3 (Rev2 is for common type of motor with fan). This is quick and dirty fix. I will have to remodel the whole extruder body one day, to make it uniform. Other parts are compatible with both types of motors and fans altogether.

Please let me know how it worked.

ToyREP Stepper Motor Cooling
by thorgal