QLOUNI 330Pcs M2 M3 M4 M5 Female Thread Knurled Brass Threaded Insert Embedment Nut Assortment Kit, Pressed Fit into Holes for 3D Prints and More Projects: Amazon.com: Industrial & Scientific
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 #4-40 and M5 Inserts Compatible with Hakko FX-888D and Weller Irons with ST Series Tips (SP40NUS). Used for Connecting 3D Printed Parts.: Amazon.com: Tools & Home Improvement
Amazon.com: E-Z LOK Threaded Insert for Plastic Flush Stainless Steel Thread Inserts M5-0.8 Pack of 5 : Industrial & Scientific