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"ii do like LM8UUs, as they are cheap, practically wear-free and require about the same amount of lubing as bushings"

Heh, well, no. Self lubricating bronze bushings require ZERO lubrication. While there are certainly variables, lm8uu's will require lubrication sooner or later, and cheap ones will probably be sooner. As for usable life, bronze bushings will last pretty much forever. How often do you need to repl
ace or lubricate the bushings on your inkjet printer?

Don't get me wrong, if you really prefer LM8uu's, go for them. I just don't feel like spending time design for parts that I feel are inferior for our application. The design is open source, I highly encourage you to improve it in any way you se
e fit.