I guess this work for all other ML-2010 printers too.
- Get .ppd file from: http://www.openprinting.org/printer/Samsung/Samsung-ML-2010. (take gdi ppd. Search for "directly download PPD" at the bottom.)
- pacman -S cups foomatic-filters ghostscript
- Configure Cups and direct your browser to http://localhost:631 (Administration) -> (Printers/Add Printer) As driver, chose the downloaded ppd file from openprinting.org and don't forget to set default page size to A4.