I agree with the hamburglar (lol) you did awesome work and you owe the internet nothing. the 3d printing community is rife with "stl please" expectations that everyone wants to share everything and it should all be free. Give it away if you can, but I think its important to have some value to the creative work like this that is done.

> I've shared it for free with every single person who has emailed me.

Excited and waiting :) I think it's going to make really cool pen plotter art