The Essential Guide to 3D Printing Post Processing

Introduction to 3D Printing Post Processing

3D Printing, with its limitless possibilities, has become a cornerstone in sectors ranging from healthcare to fashion. However, the nuances of producing an immaculate 3D printed object extend beyond the initial design and printing phases. While the process of printing is a spectacle in itself, the journey to perfection doesn’t end when the print does. Many often overlook a critical component: 3D Printing post processing. This step can drastically improve the quality and appearance of a print, transforming a good model into a great one. It’s an intricate dance of technique and finesse, making it vital for professionals and hobbyists alike.

What is 3D Printing Post Processing?

3D Printing post processing refers to the array of actions and treatments applied to an object after it emerges from a 3D Printer. This is akin to the finishing touches an artist adds to a masterpiece, ensuring it’s ready for the world to see. Just like any other manufacturing method, a 3D Printed object often requires some finishing touches to enhance its functionality, aesthetics or to make it fit for its intended application. 

Without it, prints might lack the polish and precision they’re capable of achieving. Whether it’s to achieve a smoother surface, a particular texture or even to add color, post processing 3D Prints is a skill every 3D Printing enthusiast should master, making it the silent hero behind many flawless prints.

Techniques for 3D Printing Post Processing


One of the most basic and commonly used methods, sanding is often the go-to for smoothing rough surfaces and eliminating visible layer lines, especially in PLA post processing. Beginning with a rough grain and advancing to a finer one helps achieve a gradient finish. Sanding can be done manually or with power tools, and it’s essential to progress from coarse-grit to fine-grit papers to get the best results. The process not only enhances the print’s look but also preps it for further post processing.

Priming and Painting

After sanding, priming can help prepare the print’s surface for painting, acting as a bridge between the sanded surface and paint. Once primed, a model can be painted using brushes, spray paints or even airbrushes to achieve the desired look. The palette’s limit is the imagination, with a myriad of colors and techniques available to the artist.

Solvent Smoothing

Particularly useful for post processing PLA and ABS prints, this method involves exposing the print to a solvent that partially melts the surface. When done correctly, the result is a glossy and smooth finish, reminiscent of injection molded parts. It’s vital to ensure adequate ventilation and safety measures when working with solvents.


To rectify defects or gaps in a print, fillers can be applied before sanding. These fillers, which can be proprietary or DIY mixtures, bond with the print material. Once cured, they can be sanded down to align perfectly with the model’s surface, restoring its intended form.

Support Removal

Some 3D models require support during printing. These are easily removable structures that aid in printing overhangs, ensuring the model doesn’t collapse or warp during printing. Post printing, these supports need to be carefully removed without damaging the actual print, a task requiring a gentle hand and keen eye.

Importance of 3D Printing Post Processing

3D printer post processing does more than just enhance aesthetics. It serves as the final checkpoint before a print achieves its full potential. It can:

Strengthen the Print: Some post processing techniques can make the object more robust, especially if it’s intended for functional uses. This ensures longevity and durability, particularly for objects meant for everyday use.

Achieve a Professional Finish: For industries like prototyping or even consumer goods, the final appearance of the print can be pivotal. Post processing ensures a polished, professional look that can rival traditionally manufactured items.

Customization: Post processing allows for personalization, whether it’s a specific texture, color, or finish. This tailor-made approach can meet specific needs or preferences, adding a unique touch to each print.

Exploring PLA Post Processing

PLA, or polylactic acid, is one of the most popular materials in 3D printing due to its ease of use and environmental friendliness. But its popularity also brings challenges in post processing. PLA post processing can be slightly different from other materials, primarily because PLA can be more sensitive to heat. However, innovative techniques, such as cold sanding and solvent smoothing using specific solvents, have been developed. When done correctly, PLA prints can achieve a smooth and refined finish, making them suitable for a broad range of applications.


As 3D Printing post processing continues to evolve and find new applications, delving deeper into its complexities becomes even more vital. The process isn’t complete the moment the print bed cools down. Understanding the intricacies of 3D printing post processing becomes even more essential, serving as the final touch in the journey from concept to tangible product. Whether you’re a hobbyist aiming to elevate the quality of your models or a professional seeking to deliver perfection, mastering the art of post processing 3D prints can make all the difference in the world.

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