RPF PREMIUM MEMBER
My compressor was too weak to expand the acrylic fast enough. Also I bet Weta is using an oven to control expansion better. I decided to model a dome based on the measurements I get on the finished helmet. If I have some mm deviation here and there I can account for it. Probably negative silicone lined form. If I find a used compressor with a large tank I might try again to expand the dome.