This is a test to check the noise from "made in China" LM8UU linear bearings vs "made in China" graphite impregnated bronze bushings, from the point of view of the typical RepRap 3D builder.
The point is that graphite impregnated bronze bushing make a lot less noise than LM8UU bearings, as would be expected. The cost is actually almost the same, too (one pair of bushing vs. one LM8UU), but remember that a plastic shell has to be printed for each pair of bushings, to fit in place of an LM8UU bearing.

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