in-saiL 100pcs/lot M3x4.0mm, OD4.6mm Heat Staking Threaded Insert Quik-Tek Brass C3604

They are what theyre supposed to be...

If you 3d print you need these...

They do what they are supposed to do! What can I say, they are as described.

These are perfectly sized

If you are still using captured nuts on your prints give these a shot. Incorporating them into your designs is fun, not much harder than captured hex nuts and once theyre in, they stay in.

I originally purchased these to build the Hero Me Gen6 and have no complaints. They were easy to put in with my soldering iron. I have used these for multiple projects and havent experienced any issues with the insert slipping out or rotating.