During the first cut tests I was able to step back and watch the spark patterns as the machine made some cuts. A large portion of very fine sparks get blown away at a 90 degree angle from the cutter. It would not take much to catch a large portion of the sparks (dust). These are most likely formed from the leading edge of the cut.
The main table is already 1/2" below the extrusion so this helps. I wanted to makes some guards that would help even more.
Side Dust Guards
I formed some side dust gaurds that fit over the exposed portion of the side extrusions.
I broke the guards down to two per side. They are held in place by some drop-in T-nuts and M6 screws.
The M6 T nut is meant for 2020 extrusion, but works pretty good on the 8020 10 series.
You can pick them up here:
Note that a couple of the above T nuts would not fit my 10 Series. For some reason they were a little oversized.
Front and Rear Dust Guards
I created a some front and rear gaurds that are held in place with magnets for easy removal.
First I had to attach some steel flat bar stock to the front and rear extrusions, as show here.
These could have been one piece, but I had some stock left over from the table slats, so I used those.
Held in place with some drop-in T nuts and M6 screws.
With all the guards in place I get a little over 1-1/2" of barrier to keep the blown plasma dust from escaping.