Neat project, he re-invented the wheel making his own PID Controller though. This is common practice in the bullet casting/reloading groups since the quality of bullets made can be affected by temperature variation. Here's a YouTube Video of a similar setup with a commercially made controller. Believe it or not the commercial ones are only about 20-30 bucks and they're usable in other ways if interest in SMD Soldering falls off such as a heated chamber for 3D printing.
