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Mastering Threaded Holes in 3D Printing: A Comprehensive Guide

Creating threaded holes might seem like a straightforward task, but when precision and optimization for mass production come into play, the process becomes more intricate. We will explore various methods of crafting holes for screws and delve into the art of designing them for seamless integration into your 3D-printed parts.



Simple Threaded Holes:

The most basic approach involves designing a hole either slightly larger or smaller than the intended fastener. While this method is suitable for low-criticality situations, the inherent limitations, such as potential layer splitting, make it less than optimal. Achieving dimensional control, especially in smaller holes, can be challenging.


Reduce Sag for Threaded Holes:

When creating holes from the side, the risk of sagging arises, resulting in a slightly deformed circle. An effective remedy is designing the hole with a slight oval shape. This compensates for the sag, ensuring a perfect circular hole, facilitating smoother screw insertion.


Using Heat Inserts:

For those seeking to enhance threaded hole strength without significant effort, heat-set inserts offer an excellent solution. By melting threads into the plastic through small metal inserts, you can reinforce the part. Careful engineering of the hole, ensuring ample room for the insert and maintaining solid material around it, is crucial. Consulting with us during the manufacturing process ensures reliable parts with heat inserts.

Heat Insert Placement - Threading Holes for Mass 3D Printing Production
Placing Heat Insert

Print Pause for Embedded Threads:

3D printing opens up unprecedented possibilities, such as embedding metal threads inside plastic parts. This involves inserting a nut into the part during the additive building process. The result is a robust, flanged nut within the plastic, providing unparalleled strength and reliability. This method eliminates concerns about pull-out, offering a unique advantage over traditional processes.

Print Pause Mass Production 3D Printing
Print Pause - Prior to embedding metal threads

Common Mistake When Designing Threads:

One common mistake in 3D printing threaded holes is attempting to integrate threads directly into the model. While this may eliminate secondary processing, there's a size limitation. Threads below a certain size may not be effectively printed, rendering them practically nonexistent. It's crucial to ensure thread features are sufficiently large, avoiding the risk of blending them out during printing.


Utilize Cutouts for Precision:

To achieve precise and reliable threaded holes, consider incorporating cutouts. By cutting out the top and bottom of the threads, you eliminate overhangs and narrow islands, ensuring symmetrical holes with consistently reliable threads. This design approach guarantees successful printing on the first try, providing a controllable and durable threaded feature.


Understanding the nuances of threaded holes in 3D printing is crucial for producing high-quality, mass-producible parts. Whether you opt for traditional methods, heat inserts, or innovative embedded threads, each approach has its merits. Stay tuned for more insights into optimizing your 3D printing endeavors. Happy Printing!

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