Never calibrated your printer?

OK, if you bought an almost-assembled kit, you likely also got a reasonably working configuration with it. Still, calibration allows you to raise precision with adjusting maximum speeds, acceleration, making thermistors more precise and such stuff.

One of the more popular calibration guides is here: http://reprap.org/wiki/Triffid_Hunte...ibration_Guide If you have a working printer already, the second half of that is likely more interesting.