Hi all, I've played around with the dome blowing unit on our thermo forming centre but cannot get much over a shallow bubble. Does anyone know this process well? How can I check that the pressure is high enough? I've tried keeping the material warm with a heat gun as I blow as I was concerned it was cooling too quickly but this only slightly improves the outcome. I need a nice deep half sphere for one of my A level students....... Any help/tips appreciated!