Are you sure about that model number? the eStudio 305 is a Loire (Toshiba build, not Lexmark), and I can't find any reference to a Lexmark 338 on the...
Are you saying that noise from clip is going on and on nonstop? What if you put machine to sleep via button, will it came again? This doesn't seem to...
Large MFPs and WSD/XPS are big No-no.
Maybe for smaller A4 USB home desktop printers they are OK but IMHO no MFP with LAN port should be using them....