I tried to install linkinklevel from SlackBuild which works perfectly, but it's only a library. I will need a front end that utilize this library. The same developer developed Ink, but this is what i got so far:
root@desktop:/home/willysr/ink# ink -p usb
ink v0.4.1 © 2007 Markus Heinz
Printer not supported.
Could not get ink level
Since it relies on libinklevel, the printer supported also depends on libinklevel, which is shown on their website and it seems that my printer (Canon Pixma 1880) is not yet detected. Perhaps the developer is willing to add this printer support in the future