Threaded inserts works infinitely better than captured nuts in 3D Prints. It will make the prints strong as you can torque bolts down more.
Heat inserts with a soldering tip so that they melt the plastic when installed. As the plastic cools, it solidifies around the knurls and ridges on the insert for excellent resistance to both torque and pull-out.
-Threaded Inserts size:
M3 – Dia: 4.5mm x Height: 4mm
M4 -Dia: 6mm x Height: 8mm
M5 -Dia: 7mm x Height: 10mm
Instructions: (Prepare soldering iron)
– Heat up soldering iron until it’s your material melting point (190 & above).
– Slowly push threaded inserts into 3D printed parts with the soldering iron tip, until threaded insert is flushed with the surface
Depending on your screw/bolt length, you might consider add a deeper, smaller hole below the insert so the screw doesn’t bottom out.