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You can see how to easy build a simple dust collector in this video. I made a dust collector from two plastic buckets.
Making Video :
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Did you see this ? 3D Printed Cyclone Separator - Building - Testing
I make a centrifugal air blower. It's a way to get the dust out of my workshop. I am building many parts using 10mm plywood. I use the electric motor that I removed from

I make a wood cutter from a angle grinder. This wood cutter looks like a circular saw.