There really aren't any sadly. Maybe cast magnesium, like in sewing machines. It'd be better if the printer was built out of some bio-polymer plastic so it just

There really aren't any sadly. Maybe cast magnesium, like in sewing machines. It'd be better if the printer was built out of some bio-polymer plastic so it just fell apart after 20 years. But we're rapidly getting to a paperless society so give it 10-20 years it'll be less of an issue.