Below is an image of the front of the X carriage. You can see the squirrel cage fan, and you can also see that all connections are now using an actual flex cable rather than the traditional wire bundle that all the manufacturers seem to use, including Makerbot on their previous machines. I have had to replace wires in all but one of our printers (including Rep 2) from the constant flexing, and have wondered why these guys didn't have a clue. When I was designing high speed pen plotters back in the 1980s (almost identical robotic motions as printers except much faster), we used flex circuits rather than wires. It's good for a couple orders of magnitude more flex cycles than stranded wire is.