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May 20, 2023
From Rough to Smooth: 5 Methods of Smoothing PETG Filament
Flashforge

PETG (Polyethylene Terephthalate Glycol) is a thermoplastic material that offers great strength and flexibility but can often result in rough, uneven surfaces after printing. In 3D printing, achieving a smooth finish on your PETG prints using PETG plastic filament can be a challenging task. However, with the right methods and materials, it is possible to turn a rough and uneven print into a polished masterpiece. 

In this article, we will explore five effective methods for smoothing PETG filament, providing you with the knowledge to improve your 3D printing results. Whether you're a beginner or an experienced 3D printing enthusiast, read on to discover how to take your PETG prints from rough to smooth.

Sanding: 

Sanding is one of the most popular methods for smoothing PETG filament. This process involves using sandpaper or sanding blocks to sand down the surface of your print manually. Start by using fine-grit sandpaper, such as 220 or 320 grit, to sand the surface of your 3D-printed part. Move the sandpaper in a circular motion to achieve an even finish. Then, gradually increase the grit of the sandpaper until you reach a fine grit, such as 800 or 1000 grit. Be sure to use a light touch and sand evenly, to avoid creating any new imperfections. This will give you a smooth and polished finish. However, sanding can be time-consuming and labor-intensive, especially for larger prints.

Pro-Tip: To achieve the best results when smoothing PETG filaments, it's essential to use high-quality filaments. With FlashForge PETG Pro Filaments, you can trust that you'll get the best possible finish for your prints. They are known for their superior quality and consistency, making them an ideal choice for 3D printing enthusiasts.

Flashforge PETG filaments

Polishing: 

Polishing is another effective method for smoothing PETG filament. You can use a polishing compound or paste and a polishing wheel to achieve a smooth finish. Apply a small amount of the polishing compound or paste to the wheel and then run it over the surface of your 3D-printed part in a circular motion. Continue until you achieve the desired level of smoothness.

You can also use flame polishing for the best smoothing PETG filaments. Flame polishing is a technique that involves using a flame to melt the surface of your print, creating a glossy finish. This technique requires careful control of the flame and should only be attempted by experienced individuals. It can produce great results, but it also carries a risk of melting or deforming your print if not done correctly.

Chemical Smoothing: 

Chemical smoothing is another effective method to smooth PETG prints. This technique involves using solvents such as acetone or ethyl acetate. Eventually, it dissolves the surface layer of your PETG print, resulting in a smooth & shiny surface. However, proper ventilation and safety precautions are required when using these chemicals.

Prototype made from Flashforge PETG filament

Pro-Tip:  Use premium PETG CF filaments from FlashForge to create your premium 3D prints since they have great layer adhesion and high glossiness.

Heat Smoothing:

Heat smoothing is a reliable technique to smooth PETG filament, and it involves using a heat gun or oven to heat the surface of the print, causing it to melt and even out any rough spots. The ideal temperature range for PETG filament is 80-100°C.  For this, you can slowly move the heat gun back and forth over the print or place the 3d print in the oven for a few minutes.

Caution must be exercised to prevent overheating, warping, or deformation of the print. Further, you must wear protective gear such as gloves and glasses to avoid injury.

Epoxy Coating: 

Another effective method for smoothing PETG filament is by using an epoxy coating. To use this method, start by sanding the surface of your 3D-printed part with fine-grit sandpaper to create a rough surface. This maneuver will allow the epoxy to adhere properly. Then, mix the epoxy according to the manufacturer's instructions and apply it to the surface of your 3D-printed part using a brush or roller. Once the epoxy has dried, sand the surface again with fine-grit sandpaper to achieve a smooth finish. 

Flashforge PETG filament

This method is ideal for large 3D-printed parts that require a more durable and long-lasting finish. However, it's important to note that epoxy can be toxic. That’s why use it in a well-ventilated area and wear appropriate protective gear.

To conclude ,by using these top 5 methods for smoothing PETG filament, you can achieve a professional-grade finish for your 3D prints. Moreover, these effective methods can take your 3D printing projects to the next level and achieve amazing results.