Which model TRENDnet print server do you have See
http://www.trendnet.com/products/products.asp?cat=46#26 ? (Why do I have to do your homework
)
Can you, install or reconfigure apsfilter with the HP 5 printer, temporarily connected to your OpenBSD box to get that working first?
I have an howto (still in alpha stage) of installing apsfilter and configuring it for a locally connected USB printer. It has screenshots of the complete apsfilter configuration. That is the good news. The bad news : it is from July/August 2007
If needed I can post/attach it here.