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.
That's too bad that it didn't work out for you. I printed mine with Hatchbox PLA and it's still doing great! It sounds like you might have a lot of tension on your spool? I have mine as far to the left (extruder side) as it will go with the filament coming off the top of the spool.
How is your spool and holder set up?