This is a longer version of the Snake, even more fun and bendy than the original. It's too large to fit on a Makerbot or ToM, so you will need something like a RapMan or RepRap to print it. Or you could chop it in half and print in two parts.
There are two versions. The default LongSnake is designed to have a center core section that is two filament widths thick. LongSnakeThin has a thinner, single filament thick center, so it's more flexible as a result. I recommend the thin version for PLA, at least. Both are oriented diagonally on the printbed to fit nicer.
LongSnake: 137.4mm x 137.4mm x 11.1mm tall (190mm long)
LongSnakeThin: 144.3mm x 144.2mm x 11.7mm tall (199.5mm long)
The thin version is slightly larger because Skeinforge was giving me trouble. I have been printing with 0.3mm layers and 2.0 width/thickness, so increasing the center thickness to just slightly over 0.6mm helped a lot.