@jmasterson, thank you for asking about degraded powder and how to prevent it from entering the printer again. The good news is that anything that fits through the mesh screen is reusable powder. As powder gets used, it sticks to other grains of powder, making it too large to pass through the screen. You don’t want to use that powder.
Another thing to consider is the refresh rate you are using. I have a link to our support site for your convenience.
As always, if you’re having issues or would like more in-depth answers on this, you can always open a support case, and our agents will be happy to assist you.