This article is from the 3b1 computers FAQ, by John B. Bunch with numerous contributions by others.
The line printer driver follows each close(2) of /dev/lp with a formfeed. There is no way to disable this, except by avoiding the driver altogether and going straight to the raw printer device.
# su lp $ /usr/lib/lpadmin -plp1 -mdumb -v/dev/rawlp
 
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