You may need to adjust your flow rate I have mine sent to 1.10 just depends on your printer and make sure you have arachne turned on for wall generator that way you don't have any pin holes showing throw the front of your sign.

I added a negative cube part to the frame, and have it sized to 5x5x10mm for the light strips I use but you can resize it to whatever size you need and move it to anywhere you would like for the wires to come out at that way it's completely customizable for the person printing it.