How to Smooth 3D Prints

3D printing has revolutionized the manufacturing industry as we know it. From rapid prototyping to the creation of intricate designs, 3D printing has made it possible to create complex objects with ease. However, as with any manufacturing process, there may be challenges. One of the most common issues is the rough texture that is left on the surface of 3D printed objects.

Fortunately, there are various techniques that can be used to smoothen the surface of 3D prints.

1. Sanding

Sanding is the most basic method of smoothing 3D prints. This technique involves using sandpaper to remove the rough texture from the surface of the object. The grit of the sandpaper used depends on the severity of the rough finish, and you can work your way from low to high grit. Begin with a 180 grit sandpaper, before gradually moving up to 220, 320, 400, and 600 grit sandpaper. For 3D printed objects with intricate designs, you may need to use a small piece of sandpaper or a nail file to reach all the surfaces.

2. Acetone Vapor Bath

If you own a 3D printer that is capable of printing with ABS or ASA filaments, acetone vapor baths can offer a quick and easy way to smoothen your prints. Here’s how to do it: put some acetone in a container, place your object on a stand inside the container (make sure it doesn’t come into contact with the acetone directly), and cover the container. Allow the acetone vapor to circulate over the object for approximately 10-15 minutes. Be sure to ventilate your workspace properly as acetone vapor emissions can be toxic.

3. Filler Primer Spray

Filler primer sprays can also be used to smooth 3D prints. This technique is ideal for objects with larger surfaces and curves. Apply a few thin coatings of filler primer to the object, filling in small gaps and grooves. Once the primer has dried, sand the surface of the object smooth with fine-grit sandpaper. Filler primer sprays are available from most hardware stores and typically come in a range of colors.

4. Epoxy Resin Coating

Epoxy resin coatings offer a long-lasting and durable finish for 3D prints. This method works by applying a layer of epoxy resin to the surface of the print, which creates a glossy finish while smoothing the surface. Be sure to only apply a thin layer, as too much can lead to a thick and uneven finish. Epoxy resin coatings can be tricky to apply, and a poorly done job can lead to air bubbles and an uneven surface. Therefore, practice makes perfect, and it’s important to read up on some tutorials before giving it a try.

5. Ultrasonic Cleaning

Ultrasonic cleaning is a method of using sound waves to remove dirt and debris from objects, and it can be an effective way to smooth the surfaces of 3D prints as well. This technique involves placing the object in a container filled with water and using an ultrasonic cleaner. The sound waves will create small vibrations that will help remove any bumps or lines from the surface of the object. Ultrasonic cleaning machines are commonly used in jewelry stores, but many hobbyists are beginning to purchase them as they become more affordable.


3D printing is a fascinating technology that continues to evolve rapidly. However, rough surfaces on 3D prints can be a real challenge for many designers and manufacturers. Fortunately, there are various ways to smooth the surface of 3D prints, from sanding to using an ultrasonic cleaner.

With these techniques, you can make your 3D printed objects look polished and professional.

Tyler Woodward

Tyler Woodward

Hi, I'm Tyler! I'm a passionate writer and believer in the potential of 3D printing technology. With my background in engineering and design, I bring an exciting mix of creativity and technical expertise to my writing. In addition, I pride myself on staying up to date with the latest trends in the industry.

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