So who’d of guessed? Plastic part #2 went smooth without a hitch! No shattered moulds this time (learning I am) and the plastics lab has a new gauge so I can actually measure the tank pressure, which made a huge difference.

Process. Clay sculpture-> silicon mould -> hydrocal plaster casting (positive) then loads of sanding (loads. The clear plastic pics up even DUST! So it better be a flawless sculpture, which is was, people were touching it and smiling) then vacuum forming x19.
P.S. Sweat. Hot room. Drenched head in water, but the plastic fumes still killed me. ( 6 hours to make 19).