I took an Apogee BT-80 baffle and added two short tube sections inside—BT-70 on the upper plate (left in the photos), and BT-55 on the lower plate (right in the photos), attached with J-B Weld. The idea is to restrict the hot ejection particles to the baffle interior while still allowing the free flow of ejection gas/pressure. The BT-55 chokes the flow of particles so they enter the BT-70, where they are blocked by the center of the upper plate.
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As far as cleaning, it's a simple matter of inverting the body tube after recovery, and shaking the trapped particles out the top. I doubt the build up of soot on the walls of the baffle would be a problem before this rocket hits the end of its life, so I don't worry about that.
The baffle also serves as a tube coupler. This is a BT-80, single-stage rocket using motor ejection for single deployment.