Joseph Prusa's Argument for Open Source Licensing of 3D Printers

Joseph Prusa is the person in charge of Prusa 3D printers based on open source designs that are very, very old. He created a blog post to coincide with the release of the MK4 because there's an awful lot of clones of the Prusa printers. And he's calling for a new license that doesn't let people make derivatives and make money off it.