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.
When I design my parts the dimensions are 1 to 1 meaning there are no tolerances. For the parts ti fit correctly you will need a well calibrated printer and good quality filament. If a part does not fit on a certain printer then one would have to scale the object.
Hope this helps.