Tevo Tarantula home offset Following Beny's advice, I've just setup JimBrown-MarlinTarantula firmware.
However, my X0 &amp; Y0 points are off the bed.

When trying to center my prints &amp; afterwards sending G1 X100 Y140 to the printer, I am still off center by the margins of the sizes my X0 &amp; Y0 points are divided by 2.

What should I do?
By adjusting/calibration of the center of the bed you will automatically find the correct offset values. 

This is explained in detail in this answer to the question How to center my prints on the build platform?.