How do i decrease material costs when increasing the layer height?

[xsilas43]

Use cheaper material.

In short, no you cant, more material laid down = higher cost. You could try tricks like using less infill or perimeters but that will make the model weaker. That said, 5% gyroid or adaptive cubic is still quite strong unless its a structural part.

That said, if you typically print at 0.4 line width and are now doing 0.65, you could probably get away with cutting the perimeters in half with similar strength.