Nearly all of the working parts (gears, rollers, etc.) are made out of plastic, and it would be miraculous if that printer ever made it to 20,000 pages before becoming worn out.
Don't let plastic parts prejudice you. Printers that can do 200K prints a month have plastic gears. I think plastic is used many times because they are quieter. Metal gears also get metal particles inside of the machines because they do wear down quicker than you would think.
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