M1.2 To M6 Heat Set Insert Nut Assortment - Knurled Brass Threaded Inserts For 3D Prints (Melt Injection)

If you 3D print functional parts, you know that screwing directly into plastic is a bad idea.

These brass heat-set inserts are the answer.

This assortment pack includes a range of metric sizes from the tiny M1.2 up to M6, so you've got the right insert for any project.

They're knurled on the outside, so when you heat them up with a soldering iron and press them into your 3D printed part, they melt the plastic and lock in place permanently, leaving you with a strong, reusable metal thread.

They're made of brass, which conducts heat well for easy installation.

The brand is unbranded, but the mix of sizes is perfect for anyone serious about 3D printing.

No more stripped threads—just professional-quality results every time.