Review on 🔧 iplusmile Brass Knurled Nuts - Threaded Heat Set for 3D Printer & Projects (100pcs, M3 Thread, 3x4.6x5.7mm) by George Karadimas

I have a second bag with these inserts and love them. I've used them on both 3D printed ABS parts and PC and only had one turn (due to mis-insertion). I like that the end has a smaller and round OD which helps with centering when inserting. For ABS parts I design parts with a 4mm mortise hole. My soldering iron tip has a 2.75mm round shank with a 5mm shoulder and it presses well into plastic. No additional insertion tools are required. The outside diameter of my parts is 4.6mm, which is smaller than shown in the photos, so measure the part before using it in your project. The M3 screw fits well into the thread. I use stainless steel screws which can easily ruin the brass threads on these parts if you screw them in incorrectly.