The most common configuration error is incorrect paper size. OCOM printers typically use 80mm (3 1/8") or 58mm (2 1/4") paper.
For developers creating software for OCOM printers, it is rarely necessary to write a driver from scratch. Instead, utilize libraries that communicate with the existing driver or the port directly: ocom printer driver
Key Command Codes (Standard ESC/POS):
Download the Mac Driver:
Install the Driver: