My $0.02… It is a chip separator, not a dust separator. The dust is still going to get through. This looks like it is still letting a lot of chips through though. There is a lot of “art” that we explain with science behind dust collection. Getting enough air flow, and enough pressure, and speed (which are somewhat independent properties) is needed for the design.
I don’t have a funnel/cyclone, I have a Thein baffle, which I talked about here:
Since you have a CNC, maybe it would be easier to test theories out on something like this instead? Hopefully it works OK if it’s a lot smaller.