I converted Birdman's Trilobite from Sketchup Warehouse to .stl. It's actually a difficult print. Skeinforge does some funky stuff with it. You need to print it with a raft because it builds a foundation. Even if you put it on the platform with Replicator G, it will still drive your print head into the platform if you don't use a raft. Very strange.
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Imported from Thingiverse: https://www.thingiverse.com/thing:10393
Original creator: Thaed