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All plastics have oil. A component of the raw material.
Delrin (used on many, many items like roller blade wheels) also has oil and shouldn't need lube.
If you are making parts and feel you need lubricity, look online, you can buy sheets or rods of delrin with teflon impregnated at various percentages. I have experimented with this at work and lost track after 3 million cycles without wear.
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L2R
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