We received our ROBO R1 printer today. It has a fan that it looks like it goes in front of the extruder. It was hanging down when we unboxed the equipment. I tried to push the fan and housing back onto the extruder's heat sink, I think that is where it fell from, but it won't stay in place. There are only 2 screws that hold the fan to the part the I think snaps onto the heat sink. 1. Is there a picture that shows how this fan is suppose to attach to the heat sink 2. If this part is defective where or how can I get a new part.