Kadrick420Pcs M3 M4 M5 Threaded Inserts Assortment Kit for 3D Printing Components, Metric Brass Knurled Nuts, Insert by Heat into Plastic Parts

These are good inserts for the price. They don’t spin when a torque is applied to them, and they are easy to install correctly. Just use the hole size listed for the smaller diameter and it fits like a glove. Also, make sure you use enough perimeters around the hole to ensure it’s good strength. I usually do a minimum of 4 perimeters around the holes.

Exactly what I ordered.

Great stuff. Just as expected, I've already installed over 200 in my FDM prints.

I have used these on a number of 3D prints. They work best when used with a soldering iron with tips designed for inserting this type of connector. There is a learning curve on how to use these correctly, but once you figure it out, it works well and I don't mess up too often.

Strongly recommend these inserts for 3D printed parts.

Works great

The media could not be loaded. Works just as expected and no issues with setting them using a soldering iron. Case is sturdy enough but I'd keep a rubber band around it just incase, would hate to have it accidentally open and try to pick up all the inserts. Only have tried the m5x10 and it worked perfect with my m5 bolt that I used. Great value for the money and good variety to test out. Will refill with the same brand as needed.

these work perfect for all my 3d printing needs