Paul Smedley has updated (3/16/2009) builds of CUPS
version 1.3.9, as well as Gutenprint 5.2.3, and Splix version 1.1.1.
The latest build includes improved support for USB printers. Also
available (6/28/2008) 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.