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Setting up my Brother DCP115C using MFC210C files from Brother site and the wiki https://wiki.archlinux.org/index.php/Brother_MFC-420CN
Followed wiki instructions but had similar problems to others, that is, CUPS seems to recognise the printer, but will not print anything. Messages about 'processing since....' and /var/log/cups/cupsd.log showing variable information about connected (or not connected) printers.
Looking at localhost:631 I noticed it was saying my printer was connected at usb:/dev/usb/lp0 but there is no 'folder' /dev/usb on my system
When installing as per the wiki I did a modprobe -r usblp before connecting the printer. However, from what I can tell, it is usblp that makes CUPS think that the printer is connected via /dev/usb/lp0 so perhaps usblp was somehow still 'active' on my system.
The solution to get the printer working was, after following the wiki (and a reboot), to delete the printer from localhost:631 and tell CUPS to find new printer on page http://localhost:631/admin
This time CUPS reports the printer as being connected as 'local printer' rather than on /dev/usb/lp0
I would suggest that anyone following the wiki article does a reboot after blacklisting usblp, and before connecting the printer
Note: blacklisting modules is no longer done in /etc/rc.conf with MODULES=(!lsusb ) but instead add a line to /etc/modprobe.d/modprobe.conf to blacklist usblp
#
# /etc/modprobe.d/modprobe.conf (for v2.6 kernels)
#
blacklist nv
blacklist floppy
blacklist fd0
blacklist net-pf-10
blacklist snd_pcsp
blacklist pcspkr
blacklist usblpOffline