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You're absolutely right, but I am very constrained on space and needed a custom size to properly fit my needs rather than trying to fit a large blasting cabinet in my corner of the garage.
So my cost of this is around (with materials I already had) $150. I have very little space in my shop so I needed a custom solution.
I does take a little getting used to. However, I have now used this a handful of times with my orbital sander and have had zero issues. I do eventually plan on placing my belt sander in there and see how that goes.
Thanks, it was pretty fun to build.
Garage Dust/Sanding EnclosureView Instructable »
Getting Started With Electronics