Change Default Printer Setting in Mac OSX
Under Mac environment, both Safari and Chrome do not provide an option to allow you to set a default printer and paper size. You can work around it using Firefox. Follow the instructions below.
- Open Firefox.
- Go to File Menu > Page Setup..
- Select format for your receipt printer
- Set the paper size to 72x2000mm
- Select Save as Default in the Settings drop down menu.
- Click Ok
After above steps, both Safari and Chrome will now use the new setting as default. (Remember to quit and re-launch Safari or Chrome for the settings to take effect.)