This section assumes you have either shut down or disabled the Printer you are inspecting.
Clean the projector lens every two weeks or as needed. Use a clean-room swab and >90% IPA to wipe the projector lens of any dust. Be sure to wet the clean-room swab with the IPA, rather than squirting IPA directly onto the lens. Wear 100% nitrile gloves whenever handling IPA.
Thoroughly dry each of the lenses with a microfiber cloth.
CAUTION: Do not use the Printer if material has spilled onto the projector, rather than just the lens. Do not attempt to clean the projector. Disable the Printer and contact 3D Systems Service immediately.