Reproduction classic-car trim is typically made to order: a worn original or technical drawing is 3D scanned, rebuilt as a digital model, then produced from polyamide (PA) polymer using industrial selective laser sintering (SLS), before being blasted, painted and checked against fitment references. The result is an aftermarket part that follows the shape and mounting points of the original component.
What does "made to order" actually mean?
Many small interior and exterior trim items for older cars are no longer stocked anywhere. Rather than holding large amounts of inventory, made-to-order production means each part is manufactured once it is requested. This suits low-volume classic parts, where only a handful of a given clip, bezel, vent or escutcheon might be needed each year.
It also means the digital model can be kept on file and produced again later, which is useful for parts that are otherwise difficult to source.
How is the original part copied?
The starting point is geometry. Where a usable original exists, it is 3D scanned to capture its dimensions, curves and mounting features. That scan is then cleaned up and rebuilt as a CAD model, with damage, wear and warping corrected so the digital version reflects the intended shape.
Where no original survives, the model can be built from measurements, photographs and period drawings. The aim is a part that follows the form and fixing points of the component it replaces. These are aftermarket reproductions and are offered as fitment references only, not as factory components.
What is selective laser sintering (SLS)?
SLS is an industrial additive process. A thin layer of fine polymer powder is spread across a build platform, and a laser scans the layer, fusing the powder only where the part should be solid. The platform then drops slightly, a fresh layer of powder is spread, and the next cross-section is fused on top. This repeats layer by layer until the full shape is built up inside the powder bed.
Because the surrounding loose powder supports the part as it forms, SLS can produce complex shapes, clips and thin sections without separate support structures. This makes it well suited to the small, awkward trim pieces common in classic interiors.
Why polyamide (PA) polymer?
The powder used is usually polyamide, commonly PA12 (a type of nylon). It is a practical choice for functional trim parts because:
- parts come off the bed with consistent strength in multiple directions, rather than being weak along print lines;
- it tolerates the small flexing that clips and tabs need when fitted;
- it takes blasting, painting and colouring well for a finished appearance.
PA is described here on its own terms as a durable engineering polymer. It is not presented as equivalent to, or a substitute for, any specific original material.
What happens after the part comes off the machine?
A raw sintered part is covered in loose powder and has a naturally grainy, matte surface. Finishing brings it to a usable state:
- De-powdering and blasting: excess powder is removed, then the surface is bead or sand blasted to clean it and even out the texture.
- Priming and painting: blasting prepares the surface for primer and paint, which helps fill the natural grain and gives a more uniform finish. Many trim parts are then sprayed or lacquered in a suitable colour.
The level of finish depends on the part. An interior bezel that is on show is treated differently from a hidden bracket or clip.
How is fitment checked?
Before a design is repeated, the model is compared against references for the relevant make and model, including the original part where available and its known mounting points. The focus is on the locating features, the overall dimensions and how the part sits against neighbouring panels or fixings.
Trim still varies between cars of the same model because of age, repairs and earlier modifications, so a small amount of adjustment on fitting can be normal. You can browse parts by vehicle in the parts collections to find items listed against your make and model.
How long does production take?
Because parts are made to order rather than pulled from a shelf, there is a lead time. This covers preparing or confirming the digital model, the sintering build itself (which is often run in batches), and the finishing stages of blasting and painting. Lead times vary by part and current workload, so the timescale is confirmed at the point of order rather than promised as a fixed figure here.
The short version
Reproduction trim is digitised from an original or from records, sintered from PA polymer one layer at a time, then blasted, painted and checked against fitment references before being supplied. It is an aftermarket route to small parts that are otherwise hard to find for older vehicles.