In fact, it needs to run later than 50-udev-default.rules, so try adding
the rule to /etc/udev/rules.d/70-cups.rules
And it should look like this:
ACTION=="add", SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device",
ATTR{bInterfaceClass}=="07", ATTR{bInterfaceSubClass}=="01", GROUP="lp",
MODE="660"
--
usblp Kernel module needs to be removed and /dev/bus/usb/*/* made accessible
for USB printers to work with CUPS 1.4.x
https://bugs.launchpad.net/bugs/420015
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