I know this is on the wish list for future firmwares or for someone to write an add-on for, but has anyone attempted this using fun_plug / Optware? 
I did get it to work using my DNS-323 with Alt-F firmware in the past, but it was way too slow. It took literally 15-20 minutes for a print job to be sent to the printer.  The DNS-345 should be faster since the cpu is faster and I have twice the spindles. 
Just wondering if anyone has tried this before, maybe I can learn from their mistakes.  (I already have the .service files for my printers.)