BMO is my favorite Adventure Time character and I´ve never found one that can be easily painted, so I did this version
Very easy to put together with glue, the arms can rotate freely and I added some holes for the connection to the legs so you can put some wire through it and add extra reinforcement. You can find a model assembled and painted here:
The arms are separated because are the only ones needing minimal supports
I´ll be happy to reshape the model for any raspberry project.