For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:Bumblebee/openSUSE_Tumbleweed/X11:Bumblebee.repo
zypper refresh
zypper install primus-32bit
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:Bumblebee/openSUSE_Factory/X11:Bumblebee.repo
zypper refresh
zypper install primus-32bit
For Kernel stable standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:Bumblebee/Kernel_stable_standard/X11:Bumblebee.repo
zypper refresh
zypper install primus-32bit