I must hear this on a daily basis. It really shows how far Makerbot has sunk. Owners will not use any other filament other than Makerbot, even though they don't like it, because Makerbot tells them they will void their warranty if they use another brand. Shocked they get away with this. It is against the law. Why do people buy into this? I spoke with a customer today who informed me they couldn't use any other filament or Makerbot wouldn't replace their extruder any more. Besides being ridiculous that it's had to be replaced 4 times in a year, the tactics are really low. I would never claim to be an expert on consumer law, but I do know a thing or two about Magnuson-Moss. I would be very curious to hear any instances of people going after Makerbot for refusing to honor the warranty.