This is for general discussions. Also FAQ can be found here.
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Calibrate the heat bed extremely close to the nozzle. The extruder should smudge the filament into the heat bed. You can also adjust the stepper while printing the first layer. Just turn and push the Z-rod trough the steps until the filament really gets smudged into the heat bed.
My hint: While calibrating put a sheet of paper between the nozzle and the bed. Adjust the screws under the bed as far as the paper can still be (hardly) moved forward AND backward. Do this on the 4 corners.