Rotating a 16.2 diameter x 8.1 cm (8.1cm height as I don't have the inclination to do any more than a simple hemisphere) dome by 45 degrees on two axes comes in at 15.059586 x 15.059586 x 13.827576 cm, maybe make it 50 degrees and it'll fit
As for polys, 0.1mm sided faces are spot on for most materials, for FUD go for 0.05mm. Are you sure you didn't hit the 1 million triangle limit? 1M triangles = 500k 4 sided polys. binary stl* with 1 million triangles, zipped up should come in somewhere between 25 & 45MB.
*There are two kinds of stl, ASCII and binary. Binary stl files come in at around 1/3 the size of ASCII stl files.
[edit] I just got the same dome in under (just) the 15cm box - 14.785797 x 14.359528 x 14.849655 to be precise
Last edited: Apr 10, 2012