Best Ways to Cut 3D Printed Plastics

3D printing allows us to produce custom designs with precision and flexibility, but when 3D printing with plastic materials, you may need to modify or optimize the printed part, and reprinting the original part is too time-consuming, so cutting 3D printed plastics is a common task. In this article, we will introduce the best ways for cutting 3D printed plastics, including tools and tips to help you cut away excess material for a better fit and functionality.

Source: https://www.instructables.com/How-to-Make-a-Plastic-Cutting-Hot-Knife/

Recommended Tools for Cutting 3D Printed Plastics

When cutting 3D printed plastics, choosing the right tool is important for the quality of the cut. Here are some commonly used tools for cutting 3D printed parts:

The X-Acto knife is one of the most commonly used tools for fine work, especially when dealing with small parts and intricate details. It can easily cut common materials such as PLA, and is used for precise cutting along the edges of printed parts or removing small support materials.

The flat cutter is suitable for trimming filament supports close to the surface of the print. You can use it to remove support material or cut small parts without causing damage to the main printed part.

Hacksaws are suitable for large, solid 3D printed parts that require more force to cut, especially those made of materials such as ABS or PETG. Using a fine-toothed saw blade can reduce rough cut edges. To avoid unnecessary damage, it is recommended to maintain a steady force during operation.

The Dremel cutting tool is a versatile and efficient tool for fine cutting and adjustment. It is equipped with a rotating blade or cutting disc to help you make precise cuts, and it can also easily trim and repair small printing defects. Because its high speed may cause the plastic to melt, it is recommended to lower the speed when using it to ensure a smooth and neat cut surface and avoid uneven surfaces.

Special Tips

In some 3D forums and Youtube videos, many users said that heated knife cutting is a very effective cutting method. Using a gas blowtorch to heat the blade can easily cut common plastic materials such as PLA and ABS, and can ensure smoother cutting than traditional tools. This method can effectively prevent the edges of the material from breaking or melting during the cutting process, and ensure that the cut part is neat and without obvious defects to the greatest extent.

Source: https://www.instructables.com/How-to-Make-a-Plastic-Cutting-Hot-Knife/

Tips for Cutting 3D Printed Plastics

If you want to achieve perfect cuts, you need to practice a bit before actually cutting the final object. Here are some tips for effectively cutting 3D printed plastics:

Wear safety gear when cutting plastics: There is a chance that stray plastic fragments can fall on you or get into your eyes. Protective gloves are also recommended to prevent you from being cut by the sharp edges of the plastic.

Before cutting, draw a reference line: Masking tape can serve as a good reference for marking the cut line. You can remove the tape after the cut is complete.

Work slowly and steadily: Rushing the cut can result in jagged edges, cracks, or uneven surfaces. Whether you are using flat-nose pliers, a hacksaw, or a Dremel tool, work slowly and carefully to ensure a smooth and precise cut.

Use sandpaper to smooth the edges: Sandpaper of varying grits or a metal file can be used to remove rough spots and polish the cut surface. Always start with a coarser grit and gradually transition to a finer grit to achieve a smooth surface.

Related article: How to Split Large 3D Prints for Better Quality and Assembly

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Cutting 3D printed plastics is not difficult, but choosing the right tools and techniques is key to achieving the desired results. If you’re looking for high-quality 3D printing services or need help post-processing your prints, check out JLC3DP for a range of solutions to suit your needs.