Hi Darth - all of the prior comment plus polycarb has to be dry for it to form well. So the material has to be in a de humidifier for some time to get it to a specified water content. The material supplier will have a spec for it. There will be a specific type of material for forming. many plastics are drawn and the internal stress will relive when heated and change shape. Forming grade material will be annealed to reduce this issue... Peter


Thermoforming Polycarbonate: A Complete Guide - Wee Tect