Cyclonic filter
thingiverse
Here is a cyclonic filter that I designed and printed for my shop vac. I made it as large as I could for my printer but it should scale up well. If you do scale it don't forget to resize the ports and magnet holes. It is designed to fit 10mm magnets in the pockets. It could easily me modified to fit a 5 gallon bucket or any other catch can too.
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