Hey Guys, I've been renovating and changing the layout of my workspace and now need to relocate my cutter. Problem is I only got a 6 foot cable (parallel), I purchased a 25 foot cable and no go. Guess it's too long signals just don't reach it.

What are my options...? Can I go longer...? I have a parallel port and serial port on the cutter...

As a rule 15' max for USB 2.0 and serial ranges between 15'-30' depending upon specifications, although 9'-12' feet is considered a 'safe zone' for both. Powered hubs (though not recommended) will get you usable USB up to 90'.
Personally I was running 20' USB 1.0 for a couple of years till I set up my pcut on a wireless print server which worked out great until the computer I had designated for my plotter died and I've not reconfigured my 'temporary' (going on a year) one. I currently have a 12' USB 2.0 in use.

If you need the plotter to be away from where you're working (monitor, keyboard, mouse) I would suggest putting the computer itself with the plotter, get a wireless keyboard/mouse kit, and then get a long monitor cable.  I've run 50' VGA cables for monitors with no issue, and a wireless desktop kit has pretty decent range with a clear view.  This would allow you to work remotely, but keep the pc close to the plotter.

Hmmmmm, didn't think about doing that...? I'll check that out....