How to Use a Simple Vacuum Forming Machine
To make molds using a vacuum forming machine, complete the following steps:
Gather the vacuum forming machine, your vacuum source, frames, masking tape, and some heat resistent gloves.
When the oven is ready, put your plastic in. Watch it very carefully and don't walk away or become distracted. At first, the plastic will tighten up and then it will begin to sag. The amount you let the plastic sag is will vary on the item you are trying to form.