The Oneida is a short cone cyclone so will not separate as well as a longer cone Clearvue which is generally reckoned to separate to 99%. The longer the cone the more separation you get but by definition the more inefficient it becomes because the inefficiency is what drives the greater separation so the motor and impeller have to be sized accordingly. Bill Pentz has all the information to build a longer cone cyclone but I have never heard of any problems with the Clearvue though using filters is not used much in Australia, fairly rare in fact (at hobby level) as we vent to atmosphere and I don't know anyone who uses a wide belt being covered in dust.?