Sometimes it's simple generosity.Not sure why people give away stuff. How does that promote innovation?
I have no intention of giving away any of my designs. It takes a lot of effort to design cool stuff and there is no reason to give the work away.
I am still thinking about this and, for now, I have decided I will continue to sell just the actual printed parts through my website. I am working on redesigning that so it is easier to create sections and add parts.