Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to extend toner life [title] Perform regular printer cleanings. [substeps] Dust the exterior of the printer at least once a week to keep particles from entering the interior of the chassis. Open the printer and spray compressed air into the crevices inside.

Ending1: This prevents dust, hair and other debris from getting into the ink cartridges and gumming it up. [title] Make sure the printer heads are properly aligned. Ending2: This will delay these air inhalations and reduce the amount of time required to operate the machine. [title] Make sure that your printer is clean when transporting a toner. Ending3: The full cost of this should be around $40-$200. You can take the printer home and wash inside and out if you choose. Ending4: Remove any seals that aren't visible to the naked eye. Vacuum the printer once every week to keep dust and sludge from entering the printer.

Answer format: ending1/ending2/ending3/ending4