This is a fully articulated octopus that can be printed as one piece. I recommend 100% infill for the tentacles, so to save print time a two piece version also is included. The head can be printed at 10+% infill and attached with a #6 x 3/4 flat head wood screw. There is an alignment hole for the two parts. The optional pin can be inserted at assembly to prevent head rotation.The joints may be sticky and will probably need to be popped and worked back and forth. If a joint seems fused you can place it on a hard surface and smack it to flatten it loose. I added my own supports at the tentacle tips. They should be removed post-print.

Update: 12 /27/2017 - New STL file (one piece) with minor changes to create cleaner edges