HanglifeThreaded Inserts for Plastic, M6 Heat Set Insert for 3D Printing Components and Plastic Parts - Brass Metric Knurled Nuts (50 Pieces)

perfect for the job.Used in 3D printed parts mostly servo frames for RC aeroplanes.

Very good quality

I've found myself buying this brand in particular. They are good quality. I have bought large quantities from CNC Kitchen, but sometimes I've needed sizes I didn't have, in a hurry, so I end up in here - choose these every time. I don't put them in hot as I don't personally think that's a good idea. I fit mine using a toggle press and add they go in, you can see them rotating and effectively cutting themselves into the material. A royal pita to get out of something is wrong, so I know they work!

Using a flat end of a soldering iron at 450C made these slide into the PLA like a knife through butter!Probably better quality than the cheap M3 screws i use in them!

It works what more do you need to know

Used these in UPVC window frames to secure window screens - I've used heat-set inserts before and these are just as good as the ones I've used previously. Good kit with a decent assortment. The ones I haven't used will be good for stock.

wish there were more of the M3 sizes

These have now been used on several 3D models where inserts are needed. Fitting them using a soldering iron is very simple just take your time. Once fitted the inserts are very solid as look as you don’t over tighten them.