Considering the fact the first print came out well and the same gcode has been used i presume this could be hardware related.
I would personally check the extrusion amount to make sure you do not have a blocked nozzle and or a slipping drive gear. It would also be worth checking the tension on the x and y belts is high enough as well as making sure the z access isn't binding!
If you are able to print a simple text cube this will not take to long or use up to much material but will give us a good idea as to what the issue as the cube itself is uniform in shape and easier to spot the cause of the problem
Here is a test cube you will need to slice it using the same settings you used before! Simple 20mm Test Cube
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