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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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I can see that. But why not make it one detail wth both notch and key so the key in one detail will go in the notch of the other and its key will go in the notch of the first? Like in this picture.