How can I print wirelessly without a router?

Use Wi-Fi Direct to print wirelessly without a router from your computer, smartphone, or other wireless-enabled device. Press the Wi-Fi Direct button to turn it on, then press Wi-Fi Direct button and Information button together to print a Wi-Fi Direct guide. Follow the instructions on the guide to connect your device to the printer.

From the official HP Deskjet 3630 All-in-One Printer manual, page 5

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