Calibrating Kossel Mini 800 3D Printer Tuning & trouble shooting!

Droping down what I did to fine tune my kossel & problem that I bump to

Printrun Best software to calibrating your 3D printer, because it's simple and straight forward
https://github.com/kliment/Printrun | http://koti.kapsi.fi/~kliment/printrun/

Adjust A4988 driver current

All the driver voltage should be the same and not too high, if so the motor will get very hot (over heated), for me I adjust to around 0.35V, after that my occasionally mis-stepping issue have been solved

http://reprap.org/wiki/Pololu_stepper_driver_board

Heat bed not heat up correctly

Test and set the correct heated bed pid, you may wanna tune your hotend as well

http://reprap.org/wiki/PID_Tuning

Hotend send  "M303 E0 S200 C8"
Heated bed send  "M303 E-1 S60 C8"

And change the Kp, Ki and Kd result to your firmware configuration.h

Calibrating extruder correct distance

If your printer is extruding too much or less, your printout can become a mess. So mark your filament with pen or tape, measure the distance and adjust the fourth number in the "DEFAULT_AXIS_STEPS_PER_UNIT" in configuration.h up or down accordingly

further reading
http://www.dummies.com/how-to/content/how-to-calibrate-the-extruder-distance-on-your-3d-.html

Leveling your print-bed

Manual leveling position

G1 Z5 x-74 y-43

G1 z5 x74 y-43

G1 z5 x0 y85

The most useful and detail information I found so far

http://builda3dprinter.eu/build-manuals/kossel_mini_build_manual/calibration-2
https://docs.google.com/document/d/1wYwPmP2ZbZWeXFcjtXCqGfVvm05ZUVkkGT7-EKEv8fc/pub
http://minow.blogspot.co.uk/
https://www.mixshop.com/docs/manual/kossel/common_variables
http://reprap.org/wiki/Calibration

Trouble Shooting

Visiting the following site for solutions:
http://reprap.org/wiki/Print_Troubleshooting_Pictorial_Guide
http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide