ZM400 Platen Roller Product Name Maintenance Shaft Platen ZM400 Product Type Shaft Zebras rubber platen rollers are located directly below your printers printhead. They help create pressure to drive labels through the printer during printing to ensure clean printouts. Zebra platen roller replacements provide unmatched print quality for your label sourcing needs. Platen rollers should be replaced when they become worn or are damaged by abuse.