Amazon.com: [initeq] M3-0.5 Threaded Heat Set Inserts for 3D Printing (100, Short) : Industrial & Scientific
Using Heat Set Inserts
Virtjoule Heat Set Insert Tips for Sizes M2, M2.5, M3, M4, and M5 - Soldering Iron Tips for 3D Printer Users, 3D Printing Accessories Compatible with Hakko FX-888D and Weller SP40NKUS Soldering
Heat-Set Insert Installation tip for #4, 6, 8, 1/4" Inserts. Compatible with Hakko FX-888D and Weller SP40NKUS Irons Used for Connecting 3D Printed Parts.: Amazon.com: Tools & Home Improvement