Reducing materials used during a 3D print

I have worked on my 3D models to reduce the amount of vertices and adjust the wall thickness, etc to save the amount of print materials used. I want to use my materials as efficiently as possible.

Do you guys have any tips to reduce the amount of material used in a 3D print in a 3D model?

Any thoughts?

Generally just the fill density setting in the slicing software. In the design stage, looking at where strength is needed and removing material where it isn't.