Every 1000 hours of print time, replace both HEPA and carbon filters.
1. With the build plate clear, select CONTROL
2. Use the pointer to push the Z-axis to the top of its travel
3. Power down machine
4. Unscrew the filter cover and both filters should easily drop out
5. If necessary, use a small screwdriver to gently pry out the filters
6. Replace in reverse order