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.
Got one printed with 1.75mm Prusa supplied PLA at 0.20mm normal detail. No fusing. I think the trick is to slightly twist the horizontal tension bar along it's length with a pair of pliers first - just to introduce a bit of give - before cranking the arm back. This is what I did since suspected it would snap if I'd just tried to pull the arm straight back, would have needed more force than it could stand.
Nice model. My kids like it.