How About A Friendly Shrink? Link

Use permanent markers, colored pencils, or acrylic markers. Avoid wax-based crayons or pastels, as they will melt in the oven.

Best for permanent markers; often used for tracing. How About A Friendly Shrink?

You can use #6 plastic takeout containers (polystyrene) as a cost-effective substitute. 2. Design and Preparation Use permanent markers, colored pencils, or acrylic markers

Specifically designed for printers; has a matte side for ink adhesion. Use permanent markers

The process takes about 2–3 minutes . The plastic will curl dramatically before flattening out—this is normal.