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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
In this video, I make an adjustable drill bit. I start by using the metal I cut from the M12 bolt. Then I am cutting a Spade Drill Bit. Then I combine the two.