The lower laser window is one of the optical components between the laser source and the unsintered powder on the print bed. Contamination on the lower laser window can lead to print defects or failures.

Clean the lower laser window after every 240 hours of printing time (roughly every two weeks), or when indicated by the printer touchscreen.

To clean the lower laser window:

1. Open the print chamber door.

2. Use a telescoping mirror wand to locate the lower laser window (item 18 in the figure below).

3. Use a polyester swab wetted with Alconox to wipe the surface of the window.

4. Use a new polyester swab wetted with distilled water to wipe the surface of the window and remove any Alconox residue.

5. Use a new polyester swab wetted with ethanol to wipe the surface of the window. Allow the ethanol to evaporate before continuing to use the printer.