A look a how rapid prototyping is used in the Industrial Design process.
From the video:
Foam models are like sketches to an industrial designer. They are cheap to make and easy to produces and can help validate a design in early concept stages.
Fused Deposition Modeling
Fused deposition models (FDMs) are often used to test engineering concepts. We use it to quickly verify fit and functionality of difficult parts.
Stereolithography (SLA) machines produce higher fidelity parts than FDMs. They, like FDMs are often used to verify engineering concepts.