Looks like your Z zero position is too low. As a quick test, zero the Z axis as you usually do, then raise Z by about 0.1 or 0.15mm, and send the command "G92 Z0" (Do not have any Z homing command in the G-code print file). The effect of an incorrect Z-zero height or a non-level bed can be mitigated by increasing your first layer height, so if you are unable to get the Z home position accurate over the whole bed area, try setting a thick first layer height (which will also need you to reduce first layer speed)
Dave
