Video tutorial: Lecturer Ozan from the Mach-3D Academy demonstrates step by step how to finish a 3D-printed decorative panel – from the initial sanding to the final painting (19 mins).
3D printing post-processing encompasses all steps after printing that turn a raw component into a ready-to-install part. This includes removing support structures, surface smoothing (sanding, chemical), colouring or painting, as well as crucial steps such as drilling or tapping. Post-processing is ultimately what determines whether a part is functional and looks good.
The short answer
Post-processing turns the raw print into a ready-to-install component: removing support structures, smoothing the surface (sanding, blasting, chemical), then dyeing, painting or coating. Which step is necessary is determined by the requirements for appearance and function – not every component needs all stages.
Why is post-processing important in 3D printing?
Fresh off the printer, a component often has visible layer lines, support residues and a rough surface. For prototypes this often does not matter – for visual, functional or production parts it does not. Post-processing improves appearance, dimensional accuracy, tightness and load-bearing capacity. It is therefore a fixed cost factor that should be factored in from the very beginning.
What post-processing methods are available?
Depending on the printing process and requirements, different steps are used. This overview shows the most common methods and when they are appropriate.
| Step | Purpose | Typical of |
|---|---|---|
| Remove supports | remove support material | FDM, SLA |
| Loops | Smooth contour lines | all procedures |
| Chemical smoothing | smooth, even surface | FDM (ABS/ASA) |
| Blasting / Barrel finishing | matte, clean surface | SLS (Nylon) |
| Priming & Painting | Colour, protection, appearance | Visual and design parts |
| Colouring | solid-colour parts | SLS |
| Drilling / Tapping | Fits, screw connection | Functional parts |
Remove support structures
Overhangs are supported during printing by supports. After printing, these are removed mechanically or – in the case of soluble support – washed out. Clean design reduces supports and therefore effort; our guide to [this] provides principles on the matter DFM design.
Smooth surface
Sanding (wet, with increasing grit size) removes layer lines. With ABS FDM parts, a chemical vapour evenly smooths the surface. SLS parts are blast-cleaned or vibratory ground. Which process is suitable depends on the material – an overview can be found in our comparison FDM, SLA & SLS.
Dyeing, Painting & Coating
For visible parts, components are primed, sanded and painted – right up to a piano-lacquer finish. SLS nylon parts can be dyed through. Functional coatings increase wear or UV resistance.
How much does 3D print post-processing cost?
Post-processing is often manual work and, in the case of complex visual parts, can cost more than the printing itself. Simple support removal is cheap, whereas multi-stage sanding and painting are significantly more expensive. Anyone who just needs a functioning part saves money through minimal post-processing. You can see the guide price for your component directly in the 3D Print Price Calculator.
Post-processing by the service provider
As a 3D printing service provider, we handle the complete Manufacturing including post-processing – from the raw print to the ready-to-install, painted component. Also large parts from the large-scale 3D printing let's do the final edits. That way you get a part that fits straight away.
Frequently asked questions about 3D printing post-processing
Does 3D printing always require post-processing?
No. For simple prototypes, removing the supports is often enough. However, visual, functional and production parts benefit greatly from sanding, smoothing or painting – that determines the look and accuracy of fit.
How do you make 3D printing smooth?
By wet sanding with increasing grit size, in the case of ABS additionally by chemical vapour smoothing. SLS parts are blasted or vibrated. The surface can then be primed and painted.
Do you need a ready-to-install component? Upload your 3D file and get an estimated price including post-processing – or send a direct Manufacturing enquiry. Quote within 24 hours.
Directly from Kiel & Altenholz
Include post-processing calculation: upload file, choose options, see price.
Conclusion
Post-processing determines whether a 3D print looks like a rough part or a production component. Removing supports is a must; smoothing and painting are optional depending on the application. Anyone who defines the surface requirement before printing saves rework time and costs. What component plus post-processing actually costs is shown by the 3D printing calculator.
