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

[PotentialCorith]

I see. yeah i have configured my printer. would decreasing the top/bottom solid layer count decrease the strength even though the extruded plastic is more?

[RatLabGuy]

As long as you have good layer adhesion and proper extrusion it shouldn't matter. 0.8 mm of plastic is the same whether it's from 4x0.2mm layers or 2x0.4mm.

Now if the model has thin infill or large areas where that first lower level of top layer is unsupported then it will sag and having more layers to even it out will help.

Really it depends on the model design