To temporarily disable connectivity go to the Connectivity menu on your printer's touch screen, and under HP ePrintCenter Settings select 'disable'. Selecting this will stop the usage of remote printing with your Designjet. If you click on enable again, your printer will be ready to perform remote printing.
Use the HP Print Cost Estimator—available in the included HP Print View Software—to compare the cost of printing internally versus at a copy shop.
HP ePrint lets you print wirelessly to supported HP printers in a local Wi-Fi network or, when registered, to HP ePrinters connected to the Internet.