Today I have been back in with breathe. As the only one who has actually used the Vac former before I was asked to vac form a miniature spade and sand rake out of red, yellow and blue plastazote. At first I thought I would either have to make a mould of the objects or pack them out with clay as the pressure of the vac former can either cause thinner objects to cave in on themselves or cause an overhang. However, I found that by just reinforcing the gaps with blue foam they held up to the vac former, and the plastazote was flexible enough to allow the objects to be removed even with the slight overhang.
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