Thermoplastics: The Strongest Choice for 3D Printing The majority of today's consumer products — and many commercial ones — are composed of thermoplastics. When designing a new product, engineers can best predict its end performance by prototyping with a material as similar to the final product as possible. That's why 3D printing with thermoplastics is so widely practiced. Learn about the different FDM thermoplastics and get essential information regarding application fit and material characteristics so you can make the best choice for your use case.