QSJ 130Pcs Threaded Inserts Heat Set Inserts Kit M3x4x5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials

These threaded heat inserts are excellent—well-made, reliable, and easy to install. They heat-set cleanly into plastic with no warping or cracking, and once in place, they hold strong, providing a durable, professional-grade thread that’s perfect for repeated use. A solid product that adds real value to any build—highly recommended for makers and professionals alike.

Can't believe its taken me this long to know these exsisted. They work really well. I used about 350 degrees, and take my time and let it really cool before testing it. Def. really strong!

The inclusion of a soldering iron tip was nice. The inserts themselves are good quality and insert easily. They hold well once the plastic (I am using them in PETG) cools. They are a reasonable price.

I used these for a 3D project I've been working on, and they worked well. I really appreciated that the package included tips for the soldering iron. It was easy to use and produced a good finished product. The only thing I wish was simpler was keeping the nut straight—some of them ended up slightly crooked.

The inserts themselves are of solid quality, and I have not had any rip out to date. The included solder iron tip fits my dearest Hakko 936 iron perfectly. I've messed around with hole size for these, and with how well heat transfers through the iron tip into the brass material, I have found that I can keep a much tighter fit for ideal engagement of the insert serrations. I'm not sure how I ever lived with leaving pockets for nuts all this time when these not only work better but look awesome at the same time. A smaller hole radius means extra material will squish out the front, but the slag is simple to cut off warm with no damage to the surface.I'll probably order another few sets just to have extra tips around for my other iron and to top off the dedicated "Brass Threaded Insert" drawer.

Fits perfectly and very useful for 3d prints, good bang for the buck quantity wise

Nice, works well

Easy to install, takes a minute or two to heat up enough to lock into the print, but they work.