ECF user State O’ Flux wrote a blog post where he dove into the nuances of the coil calculator. I’ve extracted a few keywords to whet your appetite:

• User interface tricks
• Twist pitch
• Heat flux – and how heat can relate to gunking of the coil
• Battery safety

The post itself can be found at ECF, or just click this link:

Steam Engine: Basic & advanced features: Pts. One & Two