This is the day you will always remember as the day I FINALLY PRINTED THE PRUSA X-CARRIAGE!
If you can't tell, I'm really excited. It turns out that the missing ingredient to my MakerBotting success was some isopropyl alcohol (70%, a.k.a. rubbing alcohol) to clean oils off of the build platform. Once I cleaned the platform, prints started sticking like they did when I first upgraded to the HBP. It's AWESOME.
Now that I've gotten the x-carriage printed, the rest of the parts should be easy by comparison. Once I get them printed, I'll start buying the hardware for the new machine.