There is a moment in every industrial design project when the digital mockups stop telling you what you need to know. The scroll wheel feels wrong, the grip angle is awkward, the lid latch needs more travel, and there is no way to discover any of that until something physical is in your hand. Additive manufacturing has comprehensively absorbed this physical-prototyping role.
From early massing models through to pre-production functional articles, AM is the default route to physical parts in any modern industrial design studio. Our FDM and SLA capabilities cover the range that most product programs need from concept to launch.
Three stages, three different briefs
Stage one is form prototypes: rough, cheap, fast prints that exist to evaluate proportion, scale and ergonomics. PLA or PETG on a desktop printer is fine. The brief is iteration speed, not fidelity. A studio that can turn around a revision overnight learns ten times faster than one that ships parts out to a service.
Stage two is appearance prototypes: finished and painted articles that look like the production product, used for stakeholder reviews, photography and trade show display. SLA or high-quality FDM with airbrushing typically delivers these.
Stage three is functional prototypes: pre-production articles that have to work, intended for user testing, regulatory submission or pre-launch field trials. These typically require engineering thermoplastics and may approach injection-moulded part properties.
Where the brief changes the build
The most common mistake is treating all three stages with the same workflow. The build, the material and the finish should all follow the brief.
Stage 1: form models in PLA or PETG, no finishing, focus on speed.
Stage 2: appearance models in SLA or fine-layer FDM with full primer and paint.
Stage 3: functional prototypes in PA-GF, PA-CF or other engineering grades from OzFDM.
Surface finish matched to the audience: rough for design reviews, smooth for board rooms.
Material matched to the production process you actually intend to validate.
Surface finish is the hidden critical factor
Industrial design lives or dies on surface finish. A sublime form rendered in visibly layered FDM looks like a prototype no matter how good the design is. SLA delivers superior straight-off-the-printer finish at smaller part sizes, and FDM can match it with skilled post-processing through sanding, filling, priming and painting.
Our airbrushing capability is aimed specifically at this stage. A well-finished FDM print, properly airbrushed, can pass for a moulded production part to the casual eye, and often to the not-so-casual one.
The economics also work in your favour. A focused finishing pass at this stage costs a fraction of a tooling iteration, and it puts a representative article in front of the people who need to sign the program off.
Match the material to the prototype's job
Material behaviour drives many of the design decisions you are trying to validate. A functional prototype in the wrong material can give false signals about performance. If the production part will be glass-filled nylon, the functional prototype should be PA-GF. If production will be ABS, the prototype should be ABS once primed. PLA is appropriate for form models and almost nothing else once the project moves past stage one. We routinely route functional prototype work through the portfolio gallery as case-study material once the program ships.