Review on 🔥 Efficient Heat-Set Insert Installation Tip for #4-40 and M5 Inserts: Compatible with Hakko FX-888D and Weller Irons (SP40NUS) for Seamless Connection of 3D Printed Parts by Rick Rogers

This is the best way of adding inserts to printed parts I've tried so far. Simply set the iron 5 degrees above the material's extrusion temperature, apply some pressure and wait for it to click into place. The tips appear to be turned from a piece of brass bar, the finish is perfect where the slip fit should be and rough/knurled where it should be on the tip. A pair of tweezers or needle nose pliers. To hold the stakes while you line things up so you don't burn your fingers is a good idea.