Yup, that is 3D printing.. One issue that can caused gaps is the size of the item (letter width) compared to the extrusion width (width of plastic thread). Also, remember what is happening here, melted plastic is being pushed out a tiny hole under pressure while the hole is flying around at a high rate of speed with no way to actually stop the flow other than to pull the filament back a short distance. The flow does not stop instantly and when pushed forward to go again is not instant either. What you have there looks very good to me!