Hello,

With the release of HPLIP 3.9.4b we have added support for the following Designjets.

HP Designjet 4020ps (Postscript)
HP Designjet 4520ps (Postscript)
HP Designjet 4520mfp (Postscript) (Note: PC send fax not supported in this release) <!--EndFragment-->

3.9.4b Release Notes can be found at:
http://hplipopensource.com/hplip-web/release_notes.html

To find support for other Designjets can be found at:
<!--StartFragment-->http://hplipopensource.com/hplip-web/supported_devices/designjet.html <!--EndFragment-->

We are looking into other Designjet model support and hope to add support for them in the future.