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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You could easily do a 2-color print with it as it is! Just swap filament when it starts printing the numbers. I may add engraved versions if I get to it, but if you do a two-color print with engraved letters, one side of each piece will be a different color than the other. That could look super cool, but could also easily look really bad, especially if you didn't anticipate it.
Edit: I've added engraved versions, thanks for the suggestion!