Making the metal of a bushing porous so it can contain some oil is a known idea from long ago. Usually such bushings is made of bronze, sometimes brass, sometimes cast iron. The colour of the bushings in the exit unit led me to believe they are made of bronze, which is an alloy of copper and tin. Brass is an alloy of copper and zink. I should have tested with a file as bronze is much harder than brass. The way you make such parts is to press metal powder which the part is to be made of into a die where the pressure and temperature you press it with determines the porosity. It is possible to achieve porosities up to around 20 percent. But at high porosities the part becomes weaker.
Sintered bronze, brass and iron bushings use in copiers are made with a small amount of oil in them to begin with. Solid metal bushings are usually milled from solid rod and are usually milled over size and require a nylon, Teflon or delron insert. I have also seen bushings milled entirely from delron rods.
I had to dissect the machine agin, I felt an irresistible urge to know the exact processor in it
The processor is the lower part of the two missing it's heat sink.
It's an Intel Celeron at a paltry 600MHz with 512KB kache. 130nm process node, launched in 2003, so it was already an old (and cheap) part when this printer was launched in 2011.
It contains just 77 million transistors, compared to modern desktop processors containing around 10 billion transistors.
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