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Engineering guides

From 3D scanto finished part.

Scanning gives you a mesh. A mesh is not a part. The work between the two — turning millions of triangles into a clean, editable CAD model that can be manufactured — is where most of the value is, and where most people underestimate the job.

A scanner, a tablet with a scan mesh, a laptop with the CAD part and the finished printed part along one benchScan → mesh → CAD → part

The short version

  • A scan produces a mesh — a surface of triangles. Accurate, but not editable like CAD.
  • Scan-to-CAD rebuilds the part as proper geometry over the mesh. That's the skilled step.
  • Printing straight from a raw scan is possible and usually a mistake.
  • The finished part is designed to be manufactured, not just to match the scan.

What the scanner actually captures

A handheld 3D scanner projects a pattern onto the surface and reads how it deforms, building up a cloud of points and then a mesh — a skin of small triangles that follows the surface. It captures what's there with good accuracy, including wear, damage and the aftermarket parts nobody has a drawing for. It does not capture intent: it doesn't know a hole is meant to be round, or a face is meant to be flat.

Why a mesh isn't a part

A mesh is heavy, bumpy and un-editable in any useful engineering sense. You can't change a hole diameter, add a boss, or thicken a wall — you can only push triangles around. It also carries the scan's noise: a flat face is thousands of slightly uneven facets. Printing directly from a raw mesh reproduces all of that, which is fine for a rough check and wrong for a finished part.

Scan-to-CAD: rebuilding the geometry

The engineer models the part over the mesh in parametric CAD — real cylinders, real planes, real fillets — using the scan as the reference for where everything sits. That's how a worn bracket becomes a clean bracket with the right hole positions, and how a new airbox is designed to clear a strut tower that the scan says is exactly there. This is the step that takes the time and the skill, and it's what you're paying for.

The difference between a part that clears the strut tower and one that nearly does is the accuracy of the scan and the care in the CAD. Both matter.

Two monitors: a CAD airbox and the scan mesh it sits over, the printed prototype beside the keyboard
Real geometry rebuilt over the scan

Designing for manufacture

A good scan-to-CAD job doesn't just copy the original — it improves it where the original had a weakness, and it's designed for how it'll be made. Wall thicknesses and orientation for printing; flat patterns for laser cutting; places for heat-set inserts. The file that comes out is ready to make, not just ready to look at.

Prototype, test fit, manufacture

A prototype is printed and fitted to the actual car or assembly. Revisions go back into the CAD. Then the locked file is manufactured — printed here in Brendale, or laser cut and powder coated where it's metal — and it's repeatable from then on. See the services pages for each stage on its own.

Five iterations of a printed intake pipe from rough draft to finished part
Prototype, revise, lock

Questions

Asked before you ask.

Can I get just the scan data?
Yes — we'll agree a format up front. Plenty of customers take the mesh to their own designer.
How accurate does it need to be?
Accurate enough that the part fits first time. What that means depends on the part and the surface, so ask about your job rather than a headline figure.
Can you scan something that's broken?
Usually. We scan the pieces and the surfaces they mount to, then rebuild the missing geometry in CAD from the mating parts and function.

Engineering guides

Keep reading.

Also see

Where to next.

Next step

Start a scan-to-CAD job.

What it is, what car it's from, and whether we can get at it to scan.

Start a scan-to-CAD job0415 672 000