to quote manveru from march 18, 2016:

damn, i just figured out how to use my printer in nixos :D
now i just need to figure out how to use that way with cups...
gs -q -dBATCH -dSAFER -dQUIET -dNOPAUSE -sPAPERSIZE=a4 -r600x600 -sDEVICE=pamcmyk32 -sOutputFile=- Downloads/document.pdf | foo2hbpl1 | netcat 192.168.178.24 9100
anyone got an idea how to teach cups that?

I evidently have the same problem. I have a dell c1760nw and had to add this patch at http://www.cybercom.net/~dcoffin/hbpl/, and I can print this way, but I have no idea how to tell CUPS how to do this.