Someone suggested that I make a ship in a bottle and I tried using natural PLA but the transparency was very far from good enough. Hence this rounded triangular sectioned bottle with oval cut outs in two sides. The stl file for this version is tri 60 8.stl. The other stl file (MG triangular prism bottle.stl) is the same bottle but without the slots. The ship I bought from eBay (http://www.ebay.com.au/itm/221269673564?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649) To accommodate this I scaled up the stl file by a factor of 1.8 on all three dimensions.