Assuming you created the 3d model yourself, create 40x40mm square that is 2 layers tall (whatever layer height you are using.
Print the square and measure the thickness, it should be within .02mm of the model height. If it is taller you need to reduce your Z offset. If it is the proper height, examine it with a jeweler loop or USB microscope. you should not see gaps between the plastic. Measure your filament in several placed along a 1 meter length, take the average diameter and enter that into the box for filament diameter on the S3D Other Tab. Reprint and examine. If still spaces increase extrusion multiplier by .2 and retry. Never change more than one setting at a time without testing. Also temp seems a bit low, 235C works best with my printer with PETG but every printer is different.
Good luck and welcome to the art and science of 3d printing