by bdring » Sun Mar 10, 2013 2:36 pm
Most people use a piece of regular weight printer paper as a gauge. You want that to just start to have a little resistance at zero between the bed and the extruder tip.
If the tip is too high the first layer will not stick. You want that first layer to get a little flattened by thee nozzle. If the tip is too low it can be blocked by the bed and not flow.
Bart
"If you didn't build it, you will never own it."