Based on this product's specifications, here are some alternatives and similar models
Roller Zebra P1112640-252 for ZD621 Label Printer
Summary description:
The Zebra P1112640-252 Roller is a spare part designed for the ZD621 label printer. It ensures smooth operation and optimal printing performance. This roller is essential for maintaining the printer's functionality and prolonging its lifespan. Compatible with Zebra devices, it comes in a pack of one piece.