Asus RT-AC68R - Manual (Page 88)

NOTE: The print server function is supported on Windows® XP,
Windows® Vista, and Windows® 7.
To set up the EZ Printer sharing mode:
1. From the navigation panel, go to General > USB Application >
Network Printer Server.
2. Click Download Now! to download the network printer utility.
NOTE: Network printer utility is supported on Windows® XP, Windows®
Vista, and Windows® 7 only. To install the utility on Mac OS, select Use
LPR protocol for sharing printer.
3. Unzip the downloaded file and click the Printer icon to run the
network printer setup program.