Embedded M5 nut

thingiverse

This small PLA block boasts a keyhole feature on one side that enables a standard M5 bolt to pass through smoothly. To ensure seamless integration, print this component with the hole facing upwards and utilize proper post-processing G-code to pause your printing process, allowing for effortless nut insertion. Each test I've conducted has resulted in flawless extrusion of plastic over the nut without any complications. However, you may encounter adhesion issues due to printers typically printing the inner circle before the infill. To overcome this challenge, try experimenting with adhesive or plastic nuts if necessary.