High Frequency Welding HFW from Speed Plastics Ltd of Chesterfield Derbyshire UK supplying solar stills, survival aids, medical and surgical isolation tents
Sculptris is a supercool free sculpting tool. You can download it here from Pixologic.
Much like ZBrush, Sculptris is a solid-body sculpting tool. Since it has an export function, we can use it for 3D printing too! Unfortunately at this stage we don't yet support OBJ files, so there's a couple of easy hoops you need to jump through to get your design ready.
First export your sculpt as an OBJ file: