Reduce the Size and Volume of the 3D Model
Assess whether the printed 3D model needs to be the size it has been designed to be. If it can serve the same purpose at a smaller scale then less material is used to print it, saving on materials.
Another way of saving on the amount of materials used for 3D printing is hollowing out the inside of the design. Care must be taken in how thin the walls of the model are made because there must be a minimum wall thickness to maintain structural integrity.
Similar to printing a hollow model when a solid 3D printed object is not needed, another way of saving on 3D printing costs is reducing the percentage of infill used when possible. Not only does this preserve more material, 3D prints will also finish much faster.
Because 3D files are sliced into layers and printed one-by-one to form the object, the height of these layers determines the resolution of the printed item, like pixels on a computer screen. If the 3D print quality or the resolution of your object is not the primary consideration, increasing the layer height will slightly reduce the time and material used in printing.
Another way of reducing the amount of material used in the 3D printing process is by reducing or eliminating support structures and rafts when possible. There will always be projects that require support structures, but sometimes just reorienting the object on the slicing software can eliminate or reduce the number of supports needed, thereby preserving material and reducing waste.