The bushings are the the one part of the Prusa Mendel that is not printed in ABS. They are often used as a replacement for bearings. They are printed with a plastic called PLA. The reason that PLA is used is because it melts at a lower temperature. This causes a slicker print than ABS. However, they will need some lubricant to slide smoothly along the metal rods. If you want to print some for yourself you can download the .STL file from Thingiverse here. I have found that it is a good idea to print several sets of bushings to save yourself time. It also minimizes the hassle of switching between plastics.
Did you use bushings instead of bearings on your Prusa? Let me know what you think in the comments.
sources:
RepRap Wiki
Thingiverse
Ryan
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