Anyone who works with a 3D printer will recognize this frustration: you print a part, screw a bolt into it, and after a few assembly cycles the plastic simply gives up. The thread strips, the hole widens, and your once-perfect print becomes useless. That’s exactly where M3 brass heat inserts prove their value—not as a luxury add-on, but as a structural upgrade.
This set of 50 or 100 M3X4X5 heat insert nuts is designed to be embedded into plastic using heat. They perform reliably in PLA, PETG, ABS, and ASA. You gently heat the insert with a soldering iron, press it into the printed part, and once it cools down it locks firmly in place. The result is a durable metal thread inside your 3D print that can handle repeated use without wearing out. That’s why so many makers, Voron builders, and serious hobbyists choose these inserts via AliExpress.
What makes this product especially attractive is the price-to-performance ratio. For around €2.46 including VAT, you receive 50 pieces (or 100 for a slightly higher amount). This price already includes VAT and comes without extra charges such as customs or administrative fees. In the past, that was very different—unexpected costs often appeared upon delivery. Today, AliExpress takes care of everything upfront, so ordering through https://s.click.aliexpress.com/e/_c3Javzaf is clear and predictable.
In real-world use, these inserts are most common in functional prints: enclosures, brackets, printer parts, electronics housings, and mechanical assemblies. Reviews confirm this experience. Users consistently mention clean threads, smooth bolt insertion, and excellent grip once the plastic has cooled. One reviewer even tested them in ABS, ASA, PETG, and PLA with equally solid results across all materials.
It’s important to be aware that this product is also sold on “unknown” websites. On those sites, prices are often much higher and returns are usually not free—if they’re accepted at all. With AliExpress, returns are often free, and you simply avoid overpaying. My advice is straightforward: never pay more than the price listed on AliExpress and always use the official product page at https://s.click.aliexpress.com/e/_c3Javzaf.
This website was created based on the many questions people asked through the old VraagAlex website about AliExpress.
“We zijn geen officiële klantenservice van AliExpress, maar helpen je graag bij vragen over dit product of je bestelling.”
I’m here to help people, but that only works if you actually get in touch. You can contact me via the chat at the bottom of each page, via WhatsApp (clickable): https://wa.me/31102006666, and also by email or through the AI chatbot. Donations to support this help are always welcome at https://alexandervandijl.nl/doneer.
In addition to order support, I also offer computer help at home or remotely through AlexandervanDijl.nl. This service can also be used for AliExpress-related issues, 3D-printer setup, or software problems. You can find more information here:
https://alexandervandijl.nl/%f0%9f%a7%91%f0%9f%92%bb-computerhulp-aan-huis-of-op-afstand-snel-geregeld-vanuit-gouda/
Finally, one more thing I’d like to share: I’m also an ABO (Amway Business Owner). This allows you to buy products at a discount and, if you want, become an ABO in your own country to save money or even generate additional income. This link can be used both to shop and to register:
https://www.amway.nl/Anti-Hair-Fall-Shampoo-750-ml-Satinique%E2%84%A2/p/126458?aboSponsorCode=7005295153&utm_source=copy&utm_medium=sharebar&utm_campaign=nl_nl_9007005295153_108122971
What exactly are heat inserts?
They are brass threaded inserts that are installed into plastic using heat, creating a strong and durable metal thread.
Which materials are they suitable for?
They work very well in PLA, PETG, ABS, and ASA, as confirmed by customer reviews.
What size are these inserts?
They are M3 inserts with a 3 mm inner diameter, 4 mm length, and 5 mm outer diameter.
Do I need special tools?
Usually not. A standard soldering iron with a flat or rounded tip is sufficient.
Are there any hidden costs?
No. The price includes VAT, and AliExpress handles taxes in advance.
Why not buy from another store?
Because it’s often more expensive with worse return conditions. AliExpress offers the best balance between price and reliability.
Want to make your 3D prints truly strong and reusable? Visit the product page at https://s.click.aliexpress.com/e/_c3Javzaf, read the reviews, and feel free to share your experience. If you have questions, don’t hesitate to reach out—I’m happy to help.
