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.
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.