Ryan, not sure what you are talking about with the ULS having a parallel port. We have a USB port and it works every time. Ethernet is normally recommended to those having issues with USB. USB is good enough to connect my external hard drives, printers, digital cameras, and every other device out there. No reason it's not good enough to send a file to a laser.
Lasers : Trotec Speedy 300 75W, Trotec Speedy 300 80W, Galvo Fiber Laser 20W
Printers : Mimaki UJF-6042 UV Flatbed Printer , HP Designjet L26500 61" Wide Format Latex Printer, Summa S140-T 48" Vinyl Plotter
Router : ShopBot 48" x 96" CNC Router Rotary Engravers : (2) Xenetech XOT 16 x 25 Rotary Engravers
Real name Steve but that name was taken on the forum. Used Middle name. Call me Steve or Scott, doesn't matter.