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If you want to do a smooth sanding, you need a tool like this. This sanding tool, which looks like a hand plane, will come in handy.

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PDF Download : Sanding Plane Dimensions
Did you see this ? Hand Plane
Did you see this ? Sanding Blocks
I print a Cyclone Separator file that I downloaded from the internet on a 3D printer. I'm trying to make a Dust Collector using the resulting Cyclone Separator.

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