saw 3D printer the other day molding away complicated plastic shapes. Its quite fascinating. Anybody have idea in mind as to what would be an ideal design for the most efficient co2 diffuser which wouldn't slow down flow, have a near perfect CO2 disolve rate, quick and easy maintenace? best position for such diffuser - attach it to inflow or outflow? maybe a design that you can put inside one of the compartments in external filter for easy access and maintenance? Anybody has CAD software experience?