Minecraft: Fast Cobblestone Generator v2.0 (85 blocks per minute)
tested and working on 1.6.1
map download: http://www.mediafire.com/?rq2tpy2d7m3...
New improved design of my cobblestone generator.
This version uses pistons to completely avoid block loss, bringing the mined blocks up to 85 per minute!
I worked a lot on this, mostly to make it as compact as possible (my first attempt with pistons was a huge, overcomplicated contraption covering an area of 10 x 13 blocks).
I am pretty happy with this design, it's fast and reliable.
Hope it will help someone build something awesome with all that cobble!