You can use a hacksaw, fine-toothed saw, circular saw, or jigsaw to cut plastic. If you use a hacksaw or circular saw, you'll also need a plastic cutting blade. Avoid using saws or blades with large teeth because they will chip or break the plastic and create rough edges.
The three best types of saws for cutting thick plastic are a fine-toothed saw, a jigsaw, and a table saw. A fine-toothed saw works best for precision plastic cutting. If you need to make multiple non-linear cuts, this saw will serve you best. Fine-toothed saws also yield the smoothest cut.