We don’t organize based on time since there are many subphases of each phase as well as phases pertaining to other parts of the project running through all other phases. We do organize based on the type of file - concept work, analysis, design (CAD) work or engineering work - but within that we don’t clearly separate phases. Then for CAD we separate incoming and exported files from native files. Also you need different folders for different types of graphic work with temporary folders, folders for raw output/input and folders for workfiles (psd, ai, tiff etc).
We have strict file naming policies for 3D files as well based on industry guidelines. Also for files used for 3D printing, since these often go through many adjustments and conversions. We could not do without these policies!
