Clip a plastic sheet into the carrier frame and raise the lift handle until it locks. This raises the plastic to the overhead oven where it will heat until it gets soft.
Place your mold or pattern anywhere on the perforated forming surface below, (also called the platen). When the plastic has the correct amount of sag or droop, its ready to form.
Lower the handle to bring the soft plastic down and stretch it over your mold. When the handle is all the way down, open the dump valve to release the stored vacuum and suck the plastic down tightly.
The plastic cools quickly and the part can be removed.
Load another sheet and do it again.