Industrial design
& smart manufacturing engineering in Austin

A product idea becomes real in stages. Each stage produces a prototype, and each prototype should answer a specific question. The mistake teams make is building a detailed, expensive model too early, before the basic questions about size, feel and function have been settled.

The first models are sketches in three dimensions. Foam, cardboard, clay or wood cut quickly by hand. They are rough on purpose. Their job is to answer questions such as how big it should be, how it sits in the hand, and where the buttons go. A designer might make ten of these in a day, each slightly different, and hand them round the room.

Appearance models come next. They look like the finished product but do nothing. Often they are printed, sanded and painted to show colour, finish and proportion. They help stakeholders agree on the look, and they are useful for photography and early sales conversations. They should not be mistaken for proof that the product works.

Works-like prototypes are the opposite. They may be ugly, held together with tape and exposed wiring, but they perform the function. A heater heats, a mechanism clicks, a sensor reads. These models test the engineering, and they often reveal that the internal parts need more space than the appearance model assumed.

The two paths eventually meet in a combined prototype that looks and works like the product. This is where conflicts appear. The battery that fits the engineering model does not fit the slim case. The vent that keeps the circuit cool breaks the clean surface. Resolving these conflicts is the core of industrial design work.

Materials change the result. A part printed in plastic resin behaves differently from one injection moulded in production plastic. Walls flex differently, snaps break differently, surfaces feel different. For late prototypes, it is worth paying for parts made in materials close to the final ones, even at higher cost.

Keep a record of every prototype. Note what question it answered, what was learned and what changed as a result. Photographs and short notes are enough. Six months later, when someone asks why the handle is at this angle, the answer should be in the log.

Put prototypes in front of real users as early as possible. Watch how they pick it up, which way they turn it and where they look for the power button. These observations are often more useful than any lab test, and they cost almost nothing when the model is made of foam.

Finally, know when to stop. A prototype that answers its question has done its job, even if it looks unfinished. Polishing a model that has already told you what you need to know delays the next, more useful one.

Budget for iteration. The first working prototype almost never works as intended. Plan for two or three rounds at each stage, with time between them to redesign. A schedule that assumes one prototype per stage will slip.

Digital models help between physical ones. Simulations of stress, heat or airflow can rule out weak designs before anything is made. They cannot replace holding the real object. Use them to narrow the options, then build the best candidates.

Safety matters with early prototypes. Exposed batteries, sharp edges and hot parts can hurt the people testing them. Label test units clearly. Keep untested electrical prototypes away from users until someone qualified has checked them.

Most physical products must pass tests before they can be sold. Electrical products, toys, medical devices, furniture for children, anything with a battery or a heating element. The rules differ by country and by product type, but they share one feature. They are far cheaper to meet when they shape the design from the first sketch than when they are discovered late.

The first step is finding out which standards apply. This depends on what the product does, who uses it and where it will be sold. A test laboratory or a compliance consultant can list the relevant standards early, often in a short meeting. That list should sit in the design brief, alongside the target price and the intended user.

Standards affect form directly. A product for children may need no small parts that can detach, no gaps where fingers can be trapped, and rounded edges above a certain radius. An electrical product may need minimum distances between live parts and the outer case. A hot surface may need to stay below a set temperature where a hand might touch it. These are design constraints, not paperwork.

Material choice interacts with certification. Some plastics are rated for flame resistance, some are not. Some coatings contain substances restricted in certain markets. Switching material late to pass a test can change the colour, the texture and the cost of every part.

Labels and markings are part of the design too. Most certified products must carry specific symbols, warnings and ratings, often in a minimum size and a permanent form. Plan a place for them on the product and the packaging. A label squeezed onto a surface at the last moment spoils the look and may fail the permanence test.

Test early and informally. Many labs offer pre-compliance testing on prototypes. It is quicker and cheaper than full certification and shows where the risks are. Finding a problem at this stage might mean moving a vent or thickening a wall. Finding it at final certification might mean new tooling.

Keep the documentation tidy as the design evolves. Certification bodies ask for drawings, material specifications, component lists and test reports. A design team that records decisions as it goes can assemble the file in days. One that reconstructs it at the end can lose weeks.

Treat later changes carefully. Once a product is certified, even small modifications such as a new supplier for a switch or a different plastic grade can require retesting. Build that into planning for any update, and ask the lab before changing anything that touches safety.

Record the intent behind each safety feature. A later designer may otherwise remove a rib or a gap that looked unnecessary. That rib may be the reason the product passed. A short note on the drawing prevents the mistake.

Different markets bring different rules. A product sold in several countries may need to meet several standards at once. Often one stricter requirement covers the others. Find it early. Designing to the strictest version usually costs less than building separate variants.

People misuse products. Standards often require testing for foreseeable misuse, such as standing on a stool or pulling a cable. Designers should picture these situations too. Watch real people, then design for what they do instead of what the manual says.

Few companies sell a single product for long. A successful design becomes a range: a larger version, a cheaper version, a professional version, a model for another market. If each is designed separately, costs grow with every addition. If they are planned as a family, the range becomes cheaper to make and easier to recognise.

The core idea is to split each product into parts that stay the same and parts that change. A range of kitchen appliances might share the same motor, control panel and feet, while the body and capacity vary. A set of tools might share one battery, one charger and one grip. Shared parts reduce tooling, simplify stock and make repairs easier.

Decide early which elements are shared. It is much harder to retrofit commonality once the first product is in production. A designer working on the first model should already sketch the second and third, even roughly, to check that the shared parts will fit them.

Visual language ties the family together. Consistent radii, the same split lines, a recurring detail such as a colour band or a particular shape of button make separate products look related on a shelf. Customers then understand the range at a glance, and a new product benefits from the recognition of the old ones.

Too much sameness has costs too. If the cheap model looks identical to the premium one, buyers see no reason to pay more. The family needs clear steps: a better material, a larger display, an extra function that shows. Plan these differences deliberately, and make them visible.

Interfaces between parts deserve particular attention. A battery that fits every tool in the range needs a connector designed to last for years, because changing it later breaks compatibility with everything customers already own. The same applies to mounts, attachments and accessories. Treat these interfaces as long-term commitments.

Shared parts also affect suppliers. Ordering one component in large volume usually lowers its price and makes supply easier to secure. But it also concentrates risk. If that single part becomes unavailable, the whole family stops. For key components, plan a second source early.

A simple matrix helps the team. List every product in the family across the top and every major component down the side. Mark which parts are shared and which are unique. Review it before each new product begins. Unplanned new parts creep in easily, and the matrix makes them visible.

Over time the family should grow without growing complicated. When a new model appears, the question should be which existing parts it reuses, not which new ones it needs. That habit keeps the range affordable and recognisable for years.

Packaging and accessories can be shared too. A common box size with different inserts reduces the number of printed packs and simplifies shipping. A shared accessory, such as a stand or a case, can fit several products and encourage customers to stay within the range.

Drawings of shared parts need a single owner and a single revision history. When one engineer changes a shared part for one product, every other product that uses it must be checked. Without that discipline, commonality becomes a source of errors.

Plan the lifespan of each shared part. Some will outlive several generations of products, others will be replaced sooner. Knowing which is which helps the team decide where to invest in quality.

The result is a range that customers read as one company, and that the factory can build as one system. Each new model then costs less to launch than the one before it.