MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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Hello and thank you for this advice! I recently faced the same problem (plugged new 5015 fan while printer was on), it was blowing 100% all the time after powering printer on. Even with my little soldering experience I managed to replace transistor with IRLML2502, and now everything works again. There was a little burnt dot on stock transistor.