How to autotune an InkBird PID temperature controller

Here's how to autotune an InkBird PID temperature controller so that heating elements more closely match the temperature that you set.
We use these PIDs on sheet presses, extruders, and injection molders, and recommend autotuning new machines, and then seasonally, at minimum.
Check out polyvora.io for a single page set of instructions for autotuning the PID.