The Importance of Using Threaded Inserts for Assembling Circuit Boards into 3D Printed Housings

As the integration of 3D printing in electronics grows, designers and engineers are increasingly turning to 3D printed housings for their circuit boards. One critical aspect of this process is ensuring secure and reliable assembly, which can be effectively achieved using threaded inserts. In this article, JLC3DP will explore the importance of using threaded inserts for assembling circuit boards into 3D printed housings, with a focus on the practical considerations for different 3D printing materials.

What Are Threaded Inserts?

Threaded inserts are cylindrical metal components with internal threading. They are used to create durable threads in materials that are otherwise too soft to hold screws securely, such as plastics. In the context of 3D printed housings, threaded inserts provide a robust solution for mounting circuit boards and other components.

Figure 1: Example of a Threaded Insert

Why Use Threaded Inserts?

1. Enhanced Durability: Threaded inserts provide a strong and reliable connection that can withstand repeated assembly and disassembly without degrading the material.

2. Improved Mechanical Strength: They distribute the load over a larger area, reducing the stress on the 3D printed part and preventing cracking or deformation.

3. Versatility: Threaded inserts allow for the use of standard machine screws, making it easier to integrate 3D printed housings with other components.

Using Threaded Inserts with Different 3D Printing Materials

The method for installing threaded inserts varies depending on the type of 3D printing material used. Here, we discuss the procedures for PLA and other temperature-sensitive FDM materials, as well as resin-based SLA printing.

FDM Printing: PLA and Temperature-Sensitive Materials

For PLA and other temperature-sensitive materials, it is crucial to consider the hole size for inserting the threaded inserts. We recommend using a 3mm threaded insert with an outer size of 5mm and a height of 5mm.

Procedure:

1. Design the Hole: Design the hole in your 3D printed part to be 4.8mm in diameter. This slightly smaller hole size ensures a tight fit for the insert.

2. Heat the Insert: Use a hot soldering iron to heat the threaded insert. Carefully press the heated insert into the hole. The heat will slightly melt the surrounding plastic, allowing the insert to sink in and bond securely as the plastic cools.

Figure 2: Inserting Threaded Insert into PLA Using Soldering Iron

SLA Printing: Resin Materials

For resin-based SLA printing, the method differs due to the material properties. A hole size of 5mm is suitable for inserting the threaded inserts without the need for heat.

Procedure:

1. Design the Hole: Design the hole in your resin-printed part to be exactly 5mm in diameter.

2. Insert the Insert: Use some force to press the threaded insert into the hole. To ensure a secure fit, apply a small amount of super glue to the insert before pressing it in. The glue helps to keep the insert firmly in place.

Figure 3: Inserting Threaded Insert into Resin

Conclusion

Using threaded inserts in 3D printed housings for circuit boards enhances durability and mechanical strength, ensuring reliable connections that can withstand repeated use. By carefully designing the hole size and using appropriate installation techniques for different materials, you can achieve secure and lasting assemblies.

Whether you're working with PLA or resin, understanding the proper methods for installing threaded inserts will help you create robust and high-quality electronic housings. As you continue to integrate 3D printing into your electronic designs, consider the benefits of using threaded inserts to improve the longevity and reliability of your assemblies.

Figure 4: Completed Assembly with Threaded Inserts

By following these guidelines, you can leverage the full potential of threaded inserts in your 3D printed housings, ensuring that your circuit boards are securely mounted and your projects are built to last.