3D printed copper plates can drop cooling to 10% of its current cost ... theoretically.

https://newatlas.com/energy/cooling-copper-plates-data-center-energy-use/

'If those projections can be replicated at real hyperscale, the implications for data center efficiency could be enormous. The researchers’ figures would translate to a Power Usage Effectiveness (PUE) of roughly 1.011, meaning nearly every watt drawn from the grid would go directly to computation rather than to cooling overhead. This figure assumes other support infrastructure consumption to be negligible.'