Titan robotics makes massiv elarge format 3D printers roughly the size of a Prius. They don't use typical spooled filament, instead they use pellet resin used typically used for injection molding. To 3d print with these pellets a vacuum is used to pull the pellets from their storage container and then they end up in a funnel that leads into an auger. On one of the older Titan machine, there was an issue where the vacuum wouldn't shut off and then it would over fill the funnel and spill over. This problem was rooted in software but it proved difficult to source. As a reuslt, an egineeering asked me to solve the porblem by simply shutting off the vacuum after 10 seconds. So I made the green magic box you see below. It uses a couple mosfet transistors, relays, and an Arduino nano to swithc the vauum off is if was left on more than 10 seconds to prevent self destruction essentially.
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