For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:Printing/openSUSE_Tumbleweed/home:mwilck:Printing.repo
zypper refresh
zypper install gutenprint
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:Printing/openSUSE_Factory/home:mwilck:Printing.repo
zypper refresh
zypper install gutenprint
For Leap 15 2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:Printing/Leap_15_2/home:mwilck:Printing.repo
zypper refresh
zypper install gutenprint
For Leap 15 1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mwilck:Printing/Leap_15_1/home:mwilck:Printing.repo
zypper refresh
zypper install gutenprint