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.
Nice model, what program did you use?
I have a little proposal about the keyslots.
If you change the overhanging part to 45 degree wall you wouldn't need supports at all. This way there will be no dripping too.
I attached a file with a drawing to make myself extra clear.