I have been beating my head against the wall for several days trying to impliment auto bed leveling on my Zomestar. I have downloaded and configured Marlin to do what I think it's supposed to do, but no luck. I get an "OK" acknowledged when I send it, but nothing happens. I also never seem to convince myself that Marlin actually gets uploaded as the Melzi board doesn't blink it's LED but the Arduino IDE response with Upload done. Suggestions? Thanks.