400Pcs Metric Heat Set Insert, M2 M2.5 M3 M4 M5 M6 Female Thread Knurled Nuts Assortment Kit, Brass Threaded Inserts for Plastic and 3D Printing Components (Threaded Inserts Ket)

Not much to say about theses. They work great, have clean threads and fit well if you design your holes properly. They dont take much stress so durability really isnt an issue. They are worth every penny if you do a lot of 3D prints that need assembly. They just make for a more professional fit and finish that is more durable than screwing into the plastic.

I got these for some 3D printing projects which I am working on, and so far they've worked fine. They were easy to measure against and plan for, and the prints turned out great with them. I used a soldering iron to press them into place, and they were ready to go. The threads matched and everything, so no complaints here. They did the job for me

These inserts have been working well for me. I have used them in 3D prints made with PLA and PETG. The grip and the threads have been very nicely cut. I did invest in a heat insert tool that keeps them straight going in. Many of them are available on Amazon, or you can use a normal soldering iron.

Worked perfectly to heat sink into 3d printed things. Perfect fit.

Perfect !!!