These labels cost money. Don't be an asshole, and only print stuff that is really needed.
Hackerspace Printing System For Printing Labels
Box 'o Stuff Label For SAMLA boxes with common equipment
Preview
Settings
API
$ # To get a label preview
$ curl http://label.waw.hackerspace.pl/stuff/preview/60/?text=foobar | feh -
$ # To print the label
$ curl -d "" http://label.waw.hackerspace.pl/stuff/print/60/?text=foobar