So far they've been single prints. I want to try something a little bit more ambitious. My son's really into buses at the moment, and I just came across this double-decker bus with a separate shell, chassis and wheels. I'm busy printing the bus shell in blue PLA at the moment, and will switch to grey PLA for the chassis and the wheels. Then I'll have to assemble it and will let you know how it turns out in another post.