To remove debris from the material tray, complete the following steps:  

1. Select Settings > Manual Debris Removal to open the tab.
2. Set the required exposure time using the + and – icons.
   The time is material-dependent, though the 15-second time interval works well for most materials.
3. Press Expose.
4. Remove debris from the material tray by taking away a thin film of the exposed material.
5. If needed, proceed with material filtering. See Maintain Materials for details.