The Importance of Using Threaded Inserts for Assembling Circuit Boards into 3D Printed Housings
4 min
- What Are Threaded Inserts?
- Why Use Threaded Inserts?
- JLC3DP's Threaded Insert Service
- Using Threaded Inserts with Different 3D Printing Materials
- FDM Printing: PLA and Temperature-Sensitive Materials
- SLA Printing: Resin Materials
- Conclusion
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.
For a full design guide covering hole sizes, wall thickness and installation methods for MJF and SLA parts, see Why Your 3D Prints Need Threaded Inserts: MJF & SLA Guide.
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.
JLC3DP's Threaded Insert Service
JLC3DP's Threaded Insert Service covers 8 insert models (M3, M4 and M5). Design the hole to the size on the service page and JLC3DP prints the part and installs the insert.
| Insert | Hole size | Hole depth | Wall around the hole |
|---|---|---|---|
| M3 | 3.6–4.0 mm | 5.0–7.0 mm | at least 3.0 mm |
| M4 | 4.6 mm | 6.0–10.0 mm | at least 3.0 mm |
| M5 | 5.9 mm | 7.0 mm | at least 3.0 mm |
Using Threaded Inserts with Different 3D Printing Materials
This section is for inserts you install yourself. The hole size depends on the insert maker's data sheet; the sizes below are for the example insert described.
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. For the same 5 mm outer-diameter insert, 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.
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