The file 'Modular Snap-Fit Airship Trireme Upgrade 3D Printer Model' is (stl) file type, size is 1.4MB.
This is a Trireme hull upgrade for the Modular Snap-Fit Airship: http://www.thingiverse.com/thing:45295. It is currently available in a shell version but I am working on a solid version as well.