A documentary can be quite a lot of money. There's a ton of work pulling off a documentary, so just putting in his time could mean a lot of giving back.

Based on some of his comments, I wonder if he's playing it a bit too egalitarian, having everything based on community input. I hope whoever does the production is willing to make "command decisions" to stay on point. Community design of a given project without some kind of central control can look like Homer Simpson's car design, or worse.

I don't understand why he asked if a movie can be "open sourced". I'd think he'd know what Creative Commons is for, it can be applied to every kind of media asset. A custom license can be made, but that's I'd suggest a non-commercial clause, so a separate license can be made for commercial entities, and some of the proceeds of separate commercial licensing can go to fund RepRap.org and such.