Leo Martínez
Painting 3D-printed objects is a rewarding process that can elevate your creation from a simple print to a professional-looking product. While it doesn't need to be overly challenging, careful preparation is key to achieving impressive results. This includes steps such as sanding, priming, and choosing the right type of paint to ensure a flawless finish. Additionally, digital tools can be used to experiment with colours before painting the physical object. This guide will explore the techniques and considerations for painting 3D-printed objects, specifically those created using the STL file format.
| Characteristics | Values |
|---|---|
| Painting technique | Spray paint, hand paint, airbrush |
| Paint type | Acrylics, spray paint |
| Additional items required | Soft cloth, dowels, drill, primer, paintbrush, gloves, mask, respirator |
| Surface preparation | Smoothing, sanding, priming |
| Paint application | Horizontal and vertical sweeping motion |
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What You'll Learn
Preparing the 3D-printed object for painting
Smoothing the Surface
Before applying any paint, it is essential to smooth out the surface of the 3D-printed object. This can be done by sanding the entire model or specific areas with rough patches or visible layer lines. Use fine-grit sandpaper, such as 220 grit sandpaper, to gently sand the surface in a well-ventilated area while wearing a mask, especially if the material contains carbon fiber. Be cautious not to over-sand, as it can erode the delicate structure of the print.
Removing Residue and Imperfections
After sanding, use a soft brush, such as an old toothbrush, to remove any dust or residue left behind. For a more thorough clean, an inexpensive sonicator can be used to dislodge fine particles from corners and cracks. If there is glue residue from the build plate, wash it off with water and let the object dry before proceeding. Additionally, use wire cutters or tweezers to remove any small strings or blobs of filament that may have formed during the printing process.
Applying Primer
Primer plays a vital role in creating a pristine base for painting. Choose a neutral grey primer to easily identify and address imperfections. Spray an even coat of primer onto the object, following the manufacturer's instructions for the specific brand. Let the primer dry, and then inspect the surface for any remaining flaws. Apply additional coats of primer as needed, allowing each layer to dry before proceeding. The primer will fill in small cracks and create a smooth surface for the paint to adhere to.
Filling and Sanding
If there are more prominent imperfections, holes, or cracks, use modelling putty to fill and smooth out these areas. After the putty dries, lightly sand the filled areas to ensure a seamless finish. This step ensures that the final painted surface will be free of any noticeable defects.
Final Preparations
Once you are satisfied with the surface preparation, give the object a quick polish or wipe with a tack cloth to remove any remaining dust particles. Ensure that your work area is well-ventilated, and if necessary, use gloves and a respirator for protection during the painting process. Place your object on a stand or hang it with wire to easily access all sides, especially if you plan to spray paint. Alternatively, use newspaper to protect your workspace if painting outdoors or in a limited space.
Now that your 3D-printed object is meticulously prepared, you can confidently move on to the painting stage, knowing that the final result will be exceptional.
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Sanding the object
Sanding a 3D-printed object is a crucial step in achieving a smooth and polished finish. Here is a detailed guide on how to effectively sand your 3D-printed objects before painting:
Prepare the Object for Sanding
Before you begin sanding, it is important to remove any support structures and marks left by the 3D printer. This process can vary depending on the type of 3D printer used. For SLA resin 3D printers, carefully remove the support structures using tools like a knife, pliers, rotary tools, or a razor blade. For FDM printers with large layer heights, you may need to sand the entire model to ensure that layer lines are not visible.
Choose the Right Sanding Tools
The right tools will make the sanding process easier and more effective. You can use a powered detail sander or an orbital sander for faster and more efficient sanding, especially for larger objects. For smaller areas or intricate details, hand sanding with sandpaper or sanding pads may be necessary. Choose the appropriate grit size for your sandpaper, starting with a medium grit and progressing to a finer grit for a smoother finish.
Sanding Technique
Sanding 3D-printed objects requires patience and a gentle touch. Start by gently sanding the surface of the object with smooth, even strokes. Pay close attention to the layer lines and support marks, ensuring that you sand them down evenly. It is important to sand in the same direction as the layer lines to avoid creating visible scratches. Take your time and work in small sections, regularly checking your progress to avoid over-sanding certain areas.
Clean the Object After Sanding
Even after wet sanding, some dust and residue may remain on the object's surface. Use a soft brush, such as an old toothbrush, to gently remove any dust buildup. For a more thorough clean, consider using a sonicator to quickly remove fine particles from corners and cracks. If you have hard water, use deionized or distilled water to prevent spotting on the object's surface before painting.
Inspect and Prepare for Primer
After sanding, inspect the object's surface for any remaining imperfections. This is the time to ensure that the object is as smooth as possible before applying primer. If necessary, use a modelling putty to fill in any remaining cracks or holes. Once you are satisfied with the smoothness of the object, it is ready for the primer coat, which will further enhance the smoothness and prepare the surface for painting.
Sanding 3D-printed objects requires time and effort, but it is a crucial step in achieving a professional and polished finish. By following these steps, you will be able to effectively sand your 3D-printed creations and prepare them for a flawless paint job.
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Priming the object
Priming is an essential step in creating a show-stopping, professional-looking 3D printed object. The goal of priming is to create a pristine print surface before painting, filling in any small imperfections, such as cracks or holes, and creating a smooth surface.
Before priming, the surface of the 3D printed object should be smooth, with no visible layer lines. For SLA resin 3D printers, this involves removing the support structures and sanding down the support marks. FDM printers may require sanding of the entire model to ensure layer lines are not visible. A heavy primer can be used as an alternative to sanding but may obscure intricate details.
Primer paint is used to prepare the 3D printed object for further painting. It ensures better adhesion of the paint to the model's surface and covers minor defects. A neutral grey primer is often used to highlight imperfections, which can then be filled with modelling putty before the application of the final coat of primer.
After the initial sanding and priming, inspect the surface again for any remaining imperfections. Most primers have an extremely flat finish that highlights intricate details under direct light. Once the primer is completely dry, sand the model again with fine sandpaper to smooth the surface and eliminate any roughness that appeared during priming.
Primer coats should be applied in horizontal or vertical lines, keeping to the same application pattern across the entire model. Depending on the colour of the 3D printed object, one to five coats of primer may be needed. Allow the primer to dry between coats, following the manufacturer's specified drying time.
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Painting techniques
Painting 3D-printed objects requires a few steps to ensure a smooth and professional finish. Firstly, the surface of the object should be smoothed out to remove any residue left by support material, as well as any strings or blobs of filament. This can be done using a knife, pliers, rotary tools, or a razor blade. After this, the object should be sanded to create a polished finish. PolyJet, SLA, and SLS parts require less rigorous sanding than parts produced using FDM or FFF technologies.
Next, a primer should be applied to the object. Primer paint helps to fill in any remaining small cracks and holes, creating a smooth base for the paint and improving its adhesion. The number of coats of primer needed depends on the colour of the paint that will be applied afterward: darker colours require fewer coats, while lighter colours may need up to five coats. It is important to follow the instructions on the primer and allow each coat to dry completely before applying the next one.
Once the primer is dry, the final coat of paint can be applied. Spray paint is a popular choice for painting 3D-printed objects, as it can create smooth surfaces and deep colour gradients. It is important to follow the instructions on the paint can, including how far to hold the can from the object and how long to wait between coats. When painting, the paint can should be swept horizontally and vertically past the object to ensure a consistent finish.
Airbrushing is another technique that can be used to apply paint to 3D-printed objects. This method allows for the blending of colours and the creation of fine coats of paint.
It is important to note that 3D-printed objects should always be painted in a well-ventilated area, and it is recommended to wear a respirator and gloves for protection.
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Finishing touches
Before painting your 3D-printed parts, they may require some finishing. This means smoothing the surface of your part and ensuring there aren't any rough features that may prevent paint adhesion. Such features include residue left by support material, strings or blobs of filament, or visible layer lines.
To remove support material, you can use a knife, pliers, rotary tools, or a razor blade. After this, the surface of the model will be rough, so it is advised to sand it. Wet sanding is recommended to clear scratches, blemishes, and bumps. Be careful not to over-sand, as this will erode the wall, ceiling, or floor layers.
A heavy primer can be used as an alternative to sanding but may obscure intricate details. A spray-on primer is the best way to paint your printed parts as it quickly covers the surface with an even coating. Brush-on primers are available but are tricky to work with. Primer will prevent the 3D-printed part from absorbing paint and ensure better adhesion.
Once the primer coat is dry, your part is an open canvas. Using a brush and some hand paint, paint your part however you desire. Remember that things aren't "one colour" in the real world, due to light reflecting off different objects, so you get different tones. Dry each coat of paint before applying the next.
To finish your work, you can apply a thin coat of matte or gloss sealer to protect the paint. You can also create worn-out and rush effects by applying rusty paint to one of the bottom coats and then slightly scraping off the topcoat so that the desired result can be seen.
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Frequently asked questions
Acrylic paints are perfect for painting ABS, PU, PLA 3D prints and colouring Nylon filaments.
Sanding is one of the most important steps in preparing your 3D-printed object for painting. After sanding, wash the model with water and wipe it with a damp cloth to remove any remaining dust.
Primer paint is used to prepare the surface of 3D-printed objects for further painting. It ensures better adhesion of paint to the model surface and covers minor defects. Primer is essential if the end goal is to create a show-stopping object.
Dry brushing is a key technique for painting 3D-printed objects. This involves applying a small amount of paint to the brush and then wiping most of it off on a paper towel before lightly dragging it across the surface of the object. This enhances the texture and gives a slightly worn appearance.
Yes, there are a few ways to digitally paint your object. You can use Blender3D, which is free software with a paint feature, or Paint 3D, which comes with Windows. If you have access to 3D model editing software, you may also be able to choose the colour of the polygons to digitally paint your object.
