You must check out this video of RooFoo's 3D printed Tricycle for just $30 with beautiful detail, really impressive spin to the wheels and pedals this is a great example of a fully articulated single print!
Thanks for featuring my model! It was a lot of work making sure all the parts had enough clearance, but I'm happy how it turned out. As for a full sized print, that would just be ridiculous, hehe.