212.7.2 - Additive Manufacturing (AM)

Rapid Prototyping Workflow

The first phase of rapid prototyping is tactile prototyping, which focuses on bringing ideas into a tangible, albeit simple, form. It is the earliest stage in the development process and doesn't delve into intricate details but rather tries to represent the overarching concept.
- Tactical Prototyping takes an idea from an early-stage, often-abstract concept into a functional demonstration piece
Low-fidelity prototype: The aim here is speed and broader conceptual validation. It doesn’t have to look pretty or even very accurate. It's about understanding the main functionality and interactions.
- Example: From simple paper sketches showing user flow to cardboard models representing the size and form of a new gadget.
Cardboard, Popsicle Sticks, & Duct Tape: These everyday materials are ideal for this phase. They are readily available, inexpensive, and easy to work with. By using them, innovators can quickly build shapes, structures, and mechanisms to validate their initial ideas.
Why Not Just 3D Print?: While 3D printing offers precision and flexibility, sometimes the best solution is the simplest one. For initial idea validation, it might be faster to cut and tape cardboard than to design and print a 3D model. The tactile phase is all about speed and iteration.

Once basic concepts have been validated in the tactile prototyping phase, the 2nd, design phase focuses on refining the look, feel, and basic functionality of the product.
High-fidelity prototype: At this stage, prototypes start to resemble the final product in both appearance and function. These are detailed enough to give stakeholders a realistic idea of the final product.
Techniques: Parametric CAD modeling provides a digital representation of the product, allowing for easy alterations and refinements. Following this, 3D printing can bring those refined digital designs to life, offering a tangible model to interact with.

Depending on the level of product commercialization/criticality, there will also be an engineering prototyping phase, where the idea gets ready for the real world. Here, prototypes undergo rigorous testing and refinement to ensure they are functional, durable, and manufacturable.
CAE (Computer-Aided Engineering): CAE tools are employed to simulate the performance of the product under various conditions. It helps identify weaknesses, predict failures, and optimize the design for performance.
Manufacturing Processes / DFM (Design for Manufacturability): At this point, designers and engineers need to consider how the product will be manufactured on a large scale. DFM ensures that the design is optimized for cost-effective and efficient production.
Refinement: Based on the results from CAE and DFM, the design might need further tweaks. This could involve strengthening a particular part, changing materials, or simplifying a mechanism to make it more manufacturable.
End Result: By the conclusion of the engineering phase, the prototype should essentially be a production-ready version of the product, validated for both its function and its manufacturability.

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