Three Heart Gears ( FITS 120x120 BUILD PLATE / SEPARATED)

These use my a snap pin library, so they print more reliably and are much easier to assemble.

Print parts 1 then 2 then 3 and just snap fit together, (optionally add lubricant)
Assembly instructions can be found in this video: http://youtu.be/O-qwmRwOpFQ

I always recommend greasing the pins to keep it turning smoothly without squeaking. I use white lithium grease, but anything that doesn't melt plastic should work.