Once you have installed your new printer and it is working you need to update The Order Exchange to print to your new printer.
To do this go to SETTINGS
Select RETAILER SETTINGS - and click on your retailer.
Make sure you have ADVANCED SETTINGS selected and scroll down until you see the printing section:
In the PRINTING section, select the new PRINTER NAME from the drop down box, and don't forget to click SAVE when you have finished.