Print filling in intentional gap behind lettering

[patface]

Hi all,

I've got an issue with my current file where it is filling the space behind where I have put the lettering into my model, this space should be left empty.
This seems to slice correctly when I try to do it in Repetier but I am trying to move away from that to Simplyfy3D

Hoping someone can point out where I'm going wrong!
I've attached my factory file in hopes it might shed some light on what I'm talking about! You can see the unwanted fill start to happen at layer 52

Thanks!

[DarthRevan]

dkightley has great tips for models with errors like this one.

viewtopic.php?f=9&t=10713#p43385

[dkightley]

Couldn't have put it better myself.

Attached is the repaired shape file.....repaired with 3D Builder.