swirly shot glass
Description
Curved loft of a hexagon to a circle, makes a nice shot glass.
Instructions
This prints 3 layers with a .4 nozzle, pretty water tight. I added a solid version so that you can print with no infill and pick your number of layers. Also added an Autodesk Inventor file in case you're interested.
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License

let me guess, you are on an older makerbot and thus stuck with repG?
try to use another slicer other than the included skeinforge.
Take Cura for a spin and see how much more you like that. One of the pre-sets in the simple mode is the 'vase' setting, which will print only the bottom + outline of a massive object, so you don't have hollow/skin your object yourself with all the nasty seam that includes.
That is, assuming you are on a makerbot. If you use any other printer that can run marlin firmware, you are good to go anyway.