Comment # 29 on bug 938659 from Dr. Werner Fink

(In reply to Johannes Meixner from comment #28)

Maybe it would help to replace the line

  SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
ENV{ID_USB_INTERFACES}=="*:0701??:*", GROUP="lp"

with

  SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
ENV{ID_USB_INTERFACES}=="*:0701??:*", MODE:="0664", GROUP:="lp"

that means with colon a later override will be avoided