GNU/Linux Manjaro Epson ET-2810/ET-2820/ET-2850 Printer Setup – Step by step Guide
The linked tutorial shows you step-by-step How to Install Epson ET-2810/ET-2820/ET-2850 Series Printer/Scanner on Manjaro GNU/Linux Desktop – Step by step Tutorial.
And to Install Epson ET-2810/ET-2820/ET-2850 Printer on Manjaro you need to Setup the Proprietary Driver.
Especially relevant: after the Driver Installation to achieve the Printer Setup follow guidance to Add Printer!
Finally, the guide includes also detailed instructions on How to Get Started Epson Scanning.

GNU/Linux Manjaro Epson ET-2810/ET-2820/ET-2850 Printer Installation Guide