"We are also trying a new fabrication technology for making chambers – rapid prototyping investment casting from http://www.proivc.com/ . This is more expensive than the spun-pipe based chambers we have been using, but it frees us from the limits of standard pipe sizes, and makes changing nozzle dimensions easier. The surface finish is rougher than we had hoped, and there was some slight ovaling in the chamber, but it is still promising. We haven’t fired them yet."
"We are also trying a new fabrication technology for making chambers – rapid prototyping investment casting from http://www.proivc.com/ . This is more expensive than the spun-pipe based chambers we have been using, but it frees us from the limits of standard pipe sizes, and makes changing nozzle dimensions easier. The surface finish is rougher than we had hoped, and there was some slight ovaling in the chamber, but it is still promising. We haven’t fired them yet."