Quick python script to print to a file with cups.

cupsprintofile.py

#!/usr/bin/python

# sudo lpadmin -p printer-name-here -E -v socket://localhost:12000 -m raw

import socket

fpsock = socket.socket()
fpsock.bind(('127.0.0.1', 12000))
fpsock.listen(5)

while True:
  (clientsock, addr) = fpsock.accept()

  morebuffer = True
  buffer = clientsock.recv(4096)
  while morebuffer:
    nb = clientsock.recv(4096)
    if not nb:
      morebuffer = False
    buffer += nb

  outfile = open('/tmp/fakeprinter.out', 'a')
  outfile.write(buffer)
  outfile.close()

  clientsock.close()