A simple MakerBot shot glass. Looks nice, but unfortunately when I tested it, it leaked.
ianjohnson describes a treatment he used for his soap dish thing:1167 which might help.
To make water tight, see recommendation from Break90 below.
p.s. single shot = 1.5 fluid oz. = 44,360 mm^3. The input geometry was theoretically correct, but my check of the internal volume indicated a small error. shot glass
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5.3 w x
5.3 d x
2.087 w x
2.087 d x