All of the early Robo3d printer owners had the Z Axis stepper motors “disabled between moves” parameter set in the Marlin firmware configuration.h data. This made it easier to “adjust” the threaded rods by hand during printing of the loops and first layer. Many users have come to rely on “twiddling” their rods as a way of getting the first layer down as cleanly as possible. A far more convenient way to “twiddle” your rods accurately and without getting your hands dirty is to use the “baby stepping” function already built in to Marlin. “Baby Stepping” is a Marlin firmware feature which allows the Z height to be adjusted ustep by ustep up/down on the fly directly from a LCD controller turn and click knob. The function is very powerful but does not seem to be well known (eg search of this forum shows only one mention). And surprisingly, the feature is not enabled in the standard Robo firmware either. I've attached a short doc outlining why Baby Stepping is so useful for tweaking the first layer and how to set it up on your Robo. As always comments and suggestions for improvement very welcome.