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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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The problem is that the end of the powerlet isn't a proper nozzle, and you won't get anything like an even flow out of it. Combine that with the liquid nature of the propellant and the constantly-shifting center-of-gravity, and it won't ever fly straight. You need to shift the COM quite far forward.