Nophead just posted another picture of his Mendel 3d printer variant based around sheets of MDF, rather than threaded rod. It sure is pretty!
If you look carefully, you can see that the smooth rod the X-axis bearings ride on is actually asymmetrical! This is because the Mendel90 uses the absolute minimum number of bearings needed to define a 3d plane. (three) Since the right side only has the one bearing, it can use half as much rod to support the same range of motion.
I love engineering micro-optimizations like this.
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