My printer is on network at address 192.168.138.250 .

First add CUPS:

sudo pacman -Sy cups cups-browsed bluez-cups cups-pdf
sudo systemctl enable cups    
sudo systemctl start cups

Then some other dependencies (and drivers, if you want to use some other type than Epson L3150):

sudo pacman -Sy system-config-printer
sudo pacman -Sy nss-mdns
sudo pacman -Sy foomatic-db foomatic-db-ppds  
sudo pacman -S foomatic-db-nonfree foomatic-db-nonfree-ppds

And we should install the driver for L3150, which can be achieved with an AUR package (Epson only offer .deb and .rpm packages officially):