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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Thank you for your feedback. Fred was my first model and I've learned quite a bit since then. armb_r is not completely flat but when slicing at .2 I apparently got away with it. At a smaller layer height the discrepancy shows up more. I just uploaded a corrected armb_r_new that will print correctly.
Don't forget to post all your makes.