This is a boat that I made for the Make It Float Challenge. The boat is entirely 3D printed, at first I was thinking about maybe using different materials for the shafts for less friction, but it's more awesome when everything is 3D printed, easier for other people to replicate! It's should be noted the one needs some weights in order to make it work. I used Swedish coins. https://www.youtube.com/watch?v=6HBbhRpqCjc Solidworks were used to calculate the buoyancy, which was pretty easy. The hardest thing was to make the water wheel turn, I printed about 30 different water wheels before I got it right. The first water wheels didn't turn at all. But now it does! The body parts on the boat are made with the help of an Xbox Kinnect, which I bought on ebay recently. The head is mine, the hands are my fathers and the arms one of my friends. It's like frankenstein. EDIT 2015-07-27 Fixed a small artifact on "Left_Arm.STL". Thanks mathgrrl, for the observation! Read more about how I made it here: http://3dprint.com/85013/make-it-sink-makerbot-float/ http://www.3ders.org/articles/20150728-swedish-student-filip-sjoo-designs-and-3d-prints-a-cool-automated-boat.htmlI think one could easily understand how to assemble the beast when looking at the assembly called MAKE_IT_SINK.stl Some things to think about: ? The plug need to be printed two times. You need two of them. ? I all parts can be printed without supports, however there are some bridging needed on the water wheel and on some other places. ? I printed everything without glue, but if something feels too loose for you, just glue it! ? The counter weights can be moved a little bit on their rods in order to optimize things. ? In the counter weight for the arms you need to but a fairly small coin to make it work, or just some other thing. The important thing is that it is in equilibrium. Printer settings that I used: Layer height: 0.2 mm Fill Density: 100% Print speed: 40 mm/s Printing temperature: 210 C Bed temperature: 65 C Filament diameter: 1.75 mm Flow: 100% Nossle size: 0.4 mm Retraction speed: 50 mm/s Retraction distance: 4.5 mm And the printer was an Aworldnet Havit A602 Reprap Prusa i3