This may not interest you, because it requires a specialized machine, but our local community college (
Mohawk) printed our intake rollers from nylon powder using the "Selective Laser Sintering" process (SLS). We were worried these wouldn't perform, but after a season of smashing the intake rollers against defense dividers, I can report that the rollers were tougher than the hex shaft that ran through them. An FDM printed roller would have cracked or crushed in this application for sure. We were very pleased, and hope to work with Mohawk again next year to print more SLS parts.