Hey Carl, hey Jim, hey all,
Wood dust is not only the enemy of power switches or ball nuts. It is first of all the enemy of your body. Generally wood dust should never fly around and accumulate on ball screws or inside power switches or ever get so far that it is sucked in by devices with fans. Wood dust is harmful, cancerogenic, dangerous. It should entirely be collected by a powerful dust collection system.
I am very concerned when I sometimes hear or read that some people are bothered by the fact that the dust extraction is running and they switch it off or even do not plan a proper dust extraction in the first place.
I am also very sensitive to noise and I understand the desire to watch a CNC all the time. But in fact, the complete extraction of the dangerous wood dust belongs to the milling of wood. Everything else is negligent and unreasonable.
When working with power tools, there is hearing protection that you should wear, so you don’t have to worry about the dust extraction running.
PS: Some people put the dust extraction system into another room, that’s fine.