Creating Stronger 3D Prints: Tips and Techniques

 Structural integrity is crucial in 3D printing to ensure that the prints do not collapse during use. With its high-quality output, 3D printing has gained widespread acceptance as a manufacturing process. To enhance the strength of 3D printed parts, several factors come into play.

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This article will provide valuable insights on how to create strong 3D prints. Whether you own a personal 3D printer or are considering outsourcing your projects to rapid prototyping services, this information will be beneficial. Personal 3D printer owners will learn how to optimize their settings for optimal results, while those who outsource can familiarize themselves with different materials and post-processing technologies to effectively communicate with the prototyping service. Let's dive into a simplified version of how to strengthen 3D printed parts.

Adjusting Printer Settings

When it comes to personal product manufacture, owning a 3D printer offers efficiency and effectiveness. However, without an in-depth understanding of 3D printing, achieving strong prints can be challenging. Fortunately, there are various settings on your 3D printer that you can tweak to produce high-quality and robust prints. Here's how to make strong 3D prints using these settings:

Increase Infill Density

Increasing the interior density is a effective way to enhance the strength of a 3D print. The interior density ranges from 0% to 100%, where zero indicates a completely hollow structure and 100 represents a solid one.

While having a 100% infill density theoretically should yield a very strong print, many designers have found that beyond 70%, the impact on strengthening the print diminishes significantly. Moreover, extremely high infill densities result in increased filament usage, printing time, cost, and burden on the printer.

Note: Aim for at least a 20% infill density for adequate strength and consider adjusting the wall thickness (explained below) before increasing the infill density.

Increase Wall Thickness

The wall thickness of a 3D printed material is measured by "Wall Line Count" and "Outer Line Width." By increasing the wall thickness, you can significantly reinforce your prints. A thicker wall increases strength as 3D printed parts endure more strain on the outside than the inside.

In addition to strengthening the print, increasing the wall thickness also improves overhangs (challenging geometry shapes in 3D models) and enhances water tightness.

Note: For regular products, maintain a wall thickness of at least ≥1.2mm. If additional strength is necessary, consider increasing it further.

Use Thinner Layers

Using thinner layers promotes better adhesion and density between subsequent layers, resulting in stronger 3D printed parts. Designers have observed that going as low as 0.1mm (100 microns) maximizes strength; however, this does increase printing time.

Employ a Strong Infill Pattern

To reinforce 3D prints, utilizing the appropriate infill pattern is essential. Infill patterns act as internal support structures and add stiffness to the printed part, preventing wall deformation. Aim for dense infill patterns ranging from 30-50% to ensure optimal strength.

The type of infill pattern chosen also affects the strength of the print. Below are three popular infill options:

Triangular Infill Pattern: Triangular infill patterns are known for their strength and ability to resist deformation. Many 3D enthusiasts prefer triangles due to their inherent robustness.

Rectangular Infill Pattern: Rectangular infills can achieve 100% infill density through their grid-like parallel and perpendicular extrusions. Similar to triangular infills, they offer high print speeds thanks to the straight-line movement of the printhead.

Hexagonal Infill Pattern: Hexagonal infills feature tessellated hexagons and boast the highest strength-to-weight ratio. While effective in reinforcing 3D prints, they do slow down the printing process due to constant changes in printhead direction.

Adjust Flow Rate

Another method of strengthening 3D printed parts is adjusting the flow rate. However, caution must be exercised to prevent under- or over-extrusion. Designers typically make minor adjustments when it comes to flow rate.

Fine-tuning the flow rate has benefits beyond strength; many people adjust it to resolve other 3D printing issues such as achieving volumetric flow and improving accuracy.

Modify Line Width

According to Cura, a popular slicing software, strengthening 3D prints can be achieved by adjusting the line width to an even multiple of the layer height. However, drastic changes in line width may lead to over-extrusion or under-extrusion, so careful calibration is necessary.

Reduce Cooling

Cooling plays a critical role in 3D printing, affecting layer adhesion after setting. RAPID DIRECT Specifically, quick cooling can negatively impact adhesion since subsequent layers struggle to bond with each other. It's important to note that the effect of cooling also depends on the specific material being used. For instance, PLA works best with strong cooling fans. To achieve optimal results based on your chosen material, consider reducing the cooling rate accordingly.

Choose Strong Materials for Strong 3D Prints

In 3D printing, certain materials are known for their weaker properties. Thus, producing strong 3D prints involves selecting robust materials. Three major materials stand out for their strength-enhancing characteristics:

ABS: ABS is a thermoplastic widely used in 3D printing for its toughness, lightness, and versatility. Although ideal for creating sturdy 3D prints, ABS is not suitable for heavy use.

PLA: PLA is another commonly used 3D printing material renowned for its tensile strength (7250 psi) and high resolution capabilities. However, PLA degrades upon exposure to light.

PETG: This relatively new filament has been gaining popularity due to its strength. With a tensile strength ranging from 4100-8500 psi, PETG surpasses PLA in strength while falling slightly behind ABS. Compared to PLA, it offers increased rigidity but less flexibility compared to ABS.

Choosing the Right Material

Deciding on the most appropriate material among these three depends on several factors such as resistive force, bonding between layers, bending forces, rigidity, and impact resistance. Here's a comparison of the materials based on each factor:

Resistive force: PETG > PLA > ABS 

Bonding between layers: PETG > ABS and PLA

Bending force: ABS > PETG > PLA

Impact resistance: ABS = PETG > PLA

To learn more about the distinctions between PLA and ABS, you can refer to 's article highlighting the differences.

Determining Part Orientation

Part orientation is critical in reinforcing 3D prints. It refers to how a part is positioned on the 3D printer during printing. In general, 3D printers work by depositing thin layers of melted materials at gradually increasing heights, eventually forming a complete 3-dimensional structure. The interface between two layers is a weak point where breaks can occur.

A useful approach is to consider the example of printing a bracket for a shelf. The area where the largest force will act (downward) is the joint attaching the bracket to the shelf. Consequently, it's best to print this side with an opposing interface to counteract the force effectively.

If attaining ideal part orientation proves challenging, opt for using materials that exhibit better bonding tendencies, such as PETG. Additionally, it's important to note that part orientation affects the smoothness of the printed surface and the overall cost due to increased material usage.

Applying Epoxy Coating to 3D Prints

While not a direct way of strengthening prints during the printing process, applying an epoxy coating after printing can significantly enhance their durability. Epoxy coating involves using epoxy/polyepoxide to reinforce 3D prints, resulting in a resilient surface layer. This clear, shiny coating is solvent-resistant, durable, and tough, making it suitable for materials like PLA, ABS, and SLA.

Applying epoxy coating to 3D prints is a relatively simple task. Follow these steps:

1. Print your desired product according to its design.

2. Allow the print to cool before cleaning the surface.

3. Warm a small portion of the epoxy mixture until it reaches a viscous fluid consistency.

4. Using a brush, carefully apply the epoxy coating without allowing any dripping along the sides of the model. Small brushes can be used for delicate areas and corners.

5. After application, leave the print to dry.

Using just a small amount of hardener is sufficient to coat and strengthen the print. The addition of an epoxy coating enhances both strength and visual appeal.

Other Considerations for Strengthening 3D Printed Parts

Tweaking printer settings isn't the only method for achieving strong 3D prints. Outside of epoxy coating, several other techniques can be employed. Here are two noteworthy methods gaining popularity recently:

Annealing 3D Prints

Annealing involves subjecting 3D prints to increased temperatures for the purpose of enhancing strength. Tests have shown that annealing can increase the strength of 3D prints by up to 40%. This technique works well with materials such as PLA, ABS, PETG, and ASA.

The structure of plastic makes it inherently prone to failure. Prior to 3D printing, plastics possess an amorphous/unorganized microstructure. However, when heated, the amorphous structure reorganizes into a crystalline form, which weakens the material. Annealing addresses this issue by transforming large crystals into smaller ones, resulting in improved strength. You can anneal either the plastic polymer itself or the finished 3D printed parts. Achieve optimal results by heating above the glass transition point and below the melting point of the chosen material.

Electroplating Plastic 3D Prints

Electroplating provides a practical and cost-effective method to enhance the strength of 3D prints. This process involves immersing the print in an electrolyte solution along with a plating metal (popular options include zinc, chrome, and nickel). By applying an electric current through the electrolyte, metallic ions form a coating around the 3D print, creating durable and long-lasting prints.

While electroplating is effective, it does require multiple layers for enhanced strength.

Conclusion

Creating strong 3D prints is essential to ensure their reliability and durability during use. Understanding how to make strong 3D prints involves three primary elements: optimizing printer settings, selecting robust materials, and employing post-processing techniques. Whether you choose to adjust your personal 3D printer settings or communicate effectively with a prototyping service, implementing any of these methods will significantly improve the strength of your 3D prints.

If you're looking for high-quality 3D printing services, consider partnering with , one of China's leading rapid prototyping companies. We provide custom 3D printing services, including instant quotes for custom machined parts and full-dimensional inspection reports. Contact us today for all your 3D printing needs.

Frequently Asked Questions (FAQs)

How do I reinforce PLA 3D prints?

PLA is commonly used in 3D printing due to its versatility. While PLA already possesses good tensile strength, you can further reinforce PLA 3D prints using the methods outlined in this article. Applying epoxy coatings, annealing, or electroplating are commonly employed techniques.

What is the strongest 3D printable material?

Polycarbonate stands as one of the strongest materials for 3D printing. With a tensile strength of 9800 psi, polycarbonate requires high printing temperatures (approximately 145°C for the bed and 290°C for the head). Additionally, enclosing the printing area is necessary to prevent warping due to its sensitivity to open environments. Polycarbonate is ideal for producing high-strength functional components.

How can I make my prints stronger?

There are several methods to strengthen your prints beyond optimizing printer settings. You can explore stronger material options or utilize post-processing techniques such as epoxy coating, annealing, or electroplating. By employing these methods, you can significantly enhance print strength.