Many industrial machines signal their status using stack lights. They are simple technology and make it super easy to see machine status at a glance. Especially on a production floor full of machines, stack lights allow quickly gauging where attention is needed.
So naturally, I wanted to augment my 3d-printer with such a stack light, to see what it is up to, without walking over. And I want to show you how you can do it too, while also sharing some stack light lore.
