Printed Solid
Printed Solid uses the FDM (Fused Deposition Modeling) process for rapid prototyping. Their machines can build parts as large as a nine-inch cube, and they can then plastic weld or glue multiple pieces together to build larger parts. They can also create a silicone mold based off a 3D printed part of your design, and can turn 3D printed parts to metal using the investment casing process.
They offer a wide variety of material choices for prototyping. If you are familiar with the materials, you can request your preference or they will recommend a choice based on your part.
3D printed, molded and casted
Filaments used include nylon, PLA, ABS, PET, wood composites, and others.