The subsequent online video demonstrates placing threaded inserts. Installing Threaded Inserts into FDM Printed ABS Plastic
The rapid prototype printed piece acts very much like a molded thermoplastic component. The brass inserts conduct heat really well and may be raised to the plastic melt temperature quickly. An average soldering iron can be used for this. As the insert heats just a small amount of force is needed to lower it into the printed or drilled hole. Some excess plastic could possibly move out if the hole is undersized but this can be quite simply cut with a razor blade. The finished assembly is very strong.