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.

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Sounds like you've not locked the screw in place with a nut. The screw should go in to the metal piece with a nut in between, then the nut can be tightened against the metal piece to lock the screw in place at your desired height.