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 like your design so much that I redesigned it on my own :) It uses a 3.7g servo and I managed to save some mm vs your initial design.

EDIT: The housing is 41.6mm + probe tip :)