For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cyphar:printing:dymo/openSUSE_Tumbleweed/home:cyphar:printing:dymo.repo
zypper refresh
zypper install dymo-cups-drivers
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cyphar:printing:dymo/16.0/home:cyphar:printing:dymo.repo
zypper refresh
zypper install dymo-cups-drivers
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:cyphar:printing:dymo/15.6/home:cyphar:printing:dymo.repo
zypper refresh
zypper install dymo-cups-drivers