For all printed circuit board of DiGPCB, PCBs line spacing, track and line to pin distance. etc., their minimum size is 6 mil. In few cases of prototype PCB, we can support low to 4mil, but can not support mass production.
DiGPCB's factory has redundant manufacturing capacity to control the manufacturing efficiency and improve product quality.
For a gerber file, PCB design engineers and manufacturing engineers may have different level of understanding for the file,
Try to keep a clear structure, and easy to understand for your circuit board layers. To reduce the potential for errors.