I attached a new extruder to my makerbot, it has less than 11 hours of use on it, it is now producing an error code for overheating. Makerbot won't replace the product because it was purchased over 6 months ago even though it shows 10.87 hours of use. Maybe instead of a 6 month timeframe you should put a warranty good for a certain amount of hours. I use this product at a school it's easier to buy more than one item at a time. Due to money and paperwork issues, but if I don't use the product immediately them the warranty is out of date. That's kind of an old system of the product has an hours used function..