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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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I had the same problem. It wouldn't start on its own and only ran for a few seconds. Then I removed the balance and the hair spring. I rotated the hair spring 90 degrees, and pushed it back on the balance. Reassembled it all and it worked great. Getting the tension on the hair spring, along with the position of the impact pin housing and the limit screws of the pallet fork was the key to get it running well. Also look at some of the others' pictures. I used that as a starting point for the limit screws and the position of the impact pin housing.