Greeting all. Question, I'm about as new to 3D modeling as new can get. I've been working on adding some simple text to an existing model provided to me. If you look at the one on the bottom, it was done by someone else and it prints good. You can see that the W is filled in properly after I slice it (Simplify3D). The one on the top is mine and you can see the gaps in the letters and it prints with little gaps in the center of each number. I'm using Sketchup to add the text and raised border. The model looks good and solid in Sketchup and in the STL viewer after it's turned into an STL but not so good after it's sliced.

Any hints?