My replicator 2 can't print any complicate models. The good one was printed right after we changed the whole extruder set. Then the problem happen again. However it still prints simple models ok like cubes or Cylinders.

I believe it's because the nozzle is clogged as I can hear loud click sound. I tried to adjust the print temperature lower but it didn't work.

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So I open the whole set and watch the motor while printing. Here is the video:http://youtu.be/di8kyVKgdHs

I found the motor is not working at all after printing the raft and a few layers. After 20-20 layers the problem happened and no filament came out from the nozzle. I don't know if it's the reason why the nozzle gets clogged.

Can anyone help? Thanks so much!