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When your 3D print needs to handle real-world use—especially repeated assembly—threading makes all the difference. It gives screws and bolts a reliable place to grip, turning soft plastic parts into functional assemblies.
Threading sounds technical, but it’s easy once you know the basics. Whether you're building a prototype or a finished part, good threads help keep things tight, aligned, and easy to service.
Below are three common ways to add threads to your 3D prints: heat-set inserts, press-fit inserts, and tapping. Each has its strengths, depending on how the part will be used.
Heat-Set Inserts: Strong, Durable Threads That Last
Heat-set inserts are metal (usually brass) and go into your print with the help of a soldering iron. The heat softens the plastic just enough for the insert to sink in. As it cools, the plastic grips the insert tightly, locking it in place.
This method is your go-to when the part needs to be opened and closed repeatedly or when it’ll see higher clamping forces like in brackets, enclosures, or sensor mounts.
At Mech Power, we combine heat-set inserts with precision FDM printing to build tough, functional parts that hold up to repeated use.
Press-Fit Inserts: Quick and Clean for Light-Duty Parts
Press-fit inserts skip the heat. You push them directly into a tight plastic hole, where they stay put thanks to friction. It’s fast and works well for parts that don’t need to come apart often or hold much weight.
They’re a great choice for non-load-bearing parts,like covers, panels, or cosmetic assemblies.
Tapping: Cut Threads Directly Into Plastic
Tapping cuts threads straight into the printed part using a standard hand tap. It’s simple and cheap, but not built for strength. The threads can strip or wear out quickly if the part’s used often.
Still, it’s perfect for quick prototypes where you just need something that works—fast.
Which Method Should You Use?
It depends on how the part will be used:
- Heat-set inserts: Best for durability, repeat use, and strong connections.
- Press-fit inserts: Great for simple, low-stress parts.
- Tapping: Ideal for quick prototypes or low-load connections.
Each option balances ease, cost, and strength. Choosing the right one helps your prototype perform more like a finished product.
Final Thoughts
Threading doesn’t have to be complicated. With the right method, your 3D prints become more than just visual models, they become functional parts built to last.
At Mech Power, we go beyond printing. We engineer parts that work right out of the printer. From inserts to tolerances, we focus on making every detail count.