Paul Smedley has ported CUPS
version 1.4.7 (7/10/2011), as well as Gutenprint 5.2.7 (6/12/2011),
HP-LIP version 3.10.2 (5/3/2010), Splix version 1.1.1 (12/26/2008),
Foomatic version 4.05 (9/26/2010), and foo2qpdl (6/28/2010). Also
available (4/10/2009) is a CUPS port driver,
which allows interfacing the standard OS/2 printing subsystem with
CUPS. CUPS is the Common Unix Printing System; the goal is to improve
the printing support in eComStation. You can see what printers are
potentially supported; those mentioned as working with CUPS or Gutenprint should work. There is a newsgroup dedicated to discussion and feedback, as well as a HowTo.
Source. OS/2 Warp News and Rumors