Richard,
I don't have any suggestions for what to use for a dust cover. My X axis is shielded by the table and stays fairly clean. The Y and Z axis are exposed, but above the cutter. Also the air from the cutter tends to blow dust away.
The dust that does collect on the screw, I just blow away.
I'm sure some dust has gone thru the ballscrew. It does not seem to be a problem.
Bill |