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 other thing you linked isn't specific about the model of the Dremel, but as far as I know all official Dremel products use a similar thread pattern.
Use a small ruler and measure the thread count per inch and compare that to the print. Are they the same?
Something to try is use a small file or emery board to "clean up" the threads. The tolerances are tight but most people don't have issues.