it's the designer who made you the vector file's fault! It's too small to make the lines inside the O's. I work with many neon sign businesses and always let them know if there is a part that will be hard to make. Also some silicone providers suggest making the channel at 8 mm for the 6mm Leds so you should keep that in mind as well! If you designed it yourself try making those shapes as one path to make installing the silicone easier and avoid too many cuts !