Cockpit Concept have now released their LAN based Printer Interface Board. The board connects by AIRINC 740, 744 or 744A and is compatible with existing OEM aircraft printers.
B747 functionality with Aerowinx and A320 Jeehell FMGS is confirmed. 3rd party avionics software are able to write (ASCII) to Cockpit Connect to output to the printer.
Although native ProSimA320 compatibility is not available yet, the service desk reports development and integration of the board should be on the way.
More information at the Cockpit Concept website.