This is a really great blog post which shows an entire tear down of the Gen 5 Replicators.

Part 1: http://intentional3d.com/teardown-of...mart-extruder/
Part 2: http://intentional3d.com/replicator-...ardown-part-2/

I'm very impressed by the amount of power these printers have. I also feel like they could have made these 3d printers a bit better quality, if they would have been willing to spend a few extra bucks. That disappoints me a little, but I guess every company needs to save their pennies, and when you are selling tens of thousands of these things, those pennies add up.