X,Y,Z Calibration thing
thingiverse
After some research I realized that the 10x10x10 cube in not an accurate way to calibrate your steps per millimeter due to the fact that you may calibrate it to the 10 mm length but you may introduce a bigger error for bigger parts, therefore I conclude that my best shot was to calibrated to 100 mm which is half of my printed area on all 3 axis, also for the sake of experimenting I added cuts every 10 millimeters to see what kind of deviation this will have, download, print and please let me know what you get. I uploaded the Sketchup file in case you feel like modifying it.
With this file you will be able to print X,Y,Z Calibration thing with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on X,Y,Z Calibration thing.