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.
Just add a nut directly under the heat bed and tighten it. This way you can stop the screw from turning when leveling the bed.
Needless to say that it is no longer possible to level the bed with a screwdriver from above.
If you have some with a blue nylonring take these.
(Sorry, I don't know the correct english term of them. In German: "selbstsichernde Mutter")