Changing your default printer is relatively easy and can be done like so:
1. Click on your Start Menu (bottom left hand corner of the screen) and click on Settings (the small cog)
2. Search for 'Printers & Scanners', and once opened click on 'Devices and Printers' on the right hand side of the screen.
3. From here, you can right click on any one of the printers/photocopiers and 'Set as Default Printer'. This will mean everything you print will be sent to this device by default.