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Mahle has done a lot of materials engineering and parts manufacturing for Porsche over the years. A good bit of the tech has also made its way to other brands later.
The benefits I can see for the printed pistons would mostly be the lighter weight, so less energy required to move them up and down. Not a huge effect, I would think, and one that could be approximated by using a lighter wrist-pin or lighter rods.
-soD
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