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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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The customizer is, of course, just running OpenSCAD.
While it is down, people can get that program, download the thing they are interested in, and load the .scad file – there will be one – into OpenSCAD. There should be some values at the start of that file (it is text based) that you can change.
Then you hit the F6 button (whait a bit) and you can save the STL in the size you need.