Paul Smedley has released (9/25/2007) a build of CUPS 1.3.2, with ESP Ghostscript 8.15.4 and Gutenprint 5.1.3. You can print using the command line tools, or try the CUPS port driver. 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.
Source: OS/2 Warp News and Rumors.