Printed box leaks

[tombauer]

With S3D it turns out that infill is what it does with large solid areas. It leaves open parts which it fills with honeycomb or whatever you spec. I use 100% infill for mounting tabs so the small bolt will not crush the tab. But that does not apply to the bottom of a 3 x 4 inch box which 'looks' like it is solid but really is not solid enough to be liquid tight. That is where it is needed to tell it to print a solid layer. And since my box is 2mm or 5 layers thick I can easily see through it with a bright light. It looks like a starry night. I printed with each layer set as solid and tested it with alcohol and after 20 minutes it did not leak.