Why do designers model and prototype, and what roles do CAD and rapid prototyping play?
Modelling and prototyping: physical models, prototypes and mock-ups, the role of CAD and CAM, rapid prototyping (3D printing and laser cutting), virtual modelling and simulation, and how iterative testing of models refines a design.
A focused answer to Eduqas A-Level Product Design on modelling and prototyping: physical models, mock-ups and prototypes, CAD and CAM, rapid prototyping by 3D printing and laser cutting, virtual modelling and simulation, and how iterative testing of models refines a design.
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What this dot point is asking
Eduqas wants you to explain why designers model and prototype, the difference between a model, a mock-up and a prototype, and the role of CAD, CAM, rapid prototyping and simulation in modern development. Modelling and prototyping are the create-and-test heart of the iterative cycle: they turn ideas into things that can be handled, tested and improved before committing to manufacture.
Models, mock-ups and prototypes
Why model and prototype
CAD, CAM and virtual modelling
Rapid prototyping
Exam-style practice questions
Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Eduqas 20194 marksExplain two benefits of making physical models and prototypes during the development of a product, rather than relying on drawings alone.Show worked answer →
A Component 1 short-answer question. Two marks for each benefit explained, or one for each of two benefits depending on the mark scheme.
Benefit one: a physical model lets the designer and users handle the product, so its size, form, weight, ergonomics and feel can be tested in three dimensions, which a flat drawing cannot show. Faults in scale or grip are found and fixed early. Benefit two: prototypes can be tested and evaluated against the specification and by real users, generating evidence that drives the next iteration, so problems are corrected when changes are cheap rather than after manufacture.
Award marks for benefits that go beyond "you can see it", explaining what testing the model reveals. A common dropped mark is two versions of the same point.
Eduqas 20226 marksDiscuss the advantages of using CAD and rapid prototyping (such as 3D printing) in the development of a new product. Refer to a product to support your answer.Show worked answer →
A Component 1 extended question marked by levels of response. Reward CAD advantages, rapid-prototyping advantages, and product application.
CAD lets the designer model the product accurately in 3D, test fit and assembly, run simulations (stress, clearance), make changes quickly, and output files straight to manufacture (CAM). It improves accuracy and speed and stores reusable data. Rapid prototyping (3D printing, laser cutting) turns a CAD model into a physical part in hours, so the designer can hold, test and iterate a real object early and cheaply, far faster than traditional model-making.
Together they shorten the iterative loop: model in CAD, print, test, refine, repeat. A top answer applies this to a named product (a 3D-printed bracket or housing tested for fit), weighs the limits (printed parts may be weaker than the final material, CAD needs skill and software), and judges that CAD plus rapid prototyping speeds iteration and reduces cost and risk, which is its main value.
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Sources & how we know this
- Eduqas A Level Design and Technology specification (Product Design) — Eduqas (2017)