If this is only happening on the first layer than I wouldn't worry about it. It just means you are slightly closer to the bed than desired.
If this is happening on subsequent layers then you need to print either slower or hotter or with thinner layers. What is your: layer height, print speed, temperature. And are you printing PLA? For PLA cut the speeds in half from the table here:
http://umforum.ultimaker.com/index.php?/topic/3418-um2-extrusion-rates/
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illuminarti 18
If the pressure in the head gets too high. the extruder can no longer push the filament, and instead when it tries to turn, it will click back a notch - much as happens in the later stages of the automated filament load process.
This can happen whenever the print requires too much pressure. That might be because you are printing fast, or with very thick layers, or at too low of a temperature. It can also happen on the first layer if the nozzle is too close to the bed; there is no where for the plastic to get out quickly, so the pressure builds up.
What layer height are you using for your print, and what is the first-layer height set to? And what speed?
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