Still out of plastic... This has to happen though!A Van de Graaff generator is essentially a box, a tube and a ball with some gubbins that connect it together and move the charge about.A box, tube and ball are easy. With a 3D printer, so are the gubbins.When I get more plastic (3 days from now!) the beast will come to life.In the UK, the ball can be picked up from homebase from about £20.Print 2 of each and invent the rest.Once I've built it, less inventing by others required...