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.
This is explained in the text.... a few people have had problems freeing the printed in bearings so the 'loose' version increases the internal clearances to make it work for them. However, if it is too loose you end up with a spinner that rattles... the regular version is best if you can get it to work. Most printers should be okay with this version.