Wintergatan has a really awesome youtube series about building a programmable marble music machine, and it has some really cool 3d printing, CAD, and engineering content. https://www.youtube.com/watch?v=CWG5oZB593w https://ift.tt/2OES09e
Screaming Pumpkin – printed without support, what do you think? https://ift.tt/2xXb88Q https://ift.tt/2DWiRJJ