Here is opensuse forum thread which might help you.

As above thread is quite long here is what have helped me.

Run as root (or sudo) systemctl enable cups.socket to disable cups.socket.

Edit /etc/systemd/system/cupsd.service to look as following listing:

[Unit]
Description=CUPS Printing Service
After=network.target

[Service]
ExecStart=/usr/sbin/cupsd -f 

[Install]
WantedBy=multi-user.target

Reboot.