Three Heart Gears ( FITS 120x120 BUILD PLATE / SEPARATED)
thingiverse
These utilize a snap pin library, so they print with greater reliability and are significantly easier to assemble. Print parts 1, then 2, then 3 and simply snap them together; optionally add lubricant. Assembly instructions can be found in this video: http://youtu.be/O-qwmRwOpFQ I always advise greasing the pins to keep it turning smoothly without squeaking. I use white lithium grease, but anything that won't melt plastic should work.
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