SpaceX also prints its SuperDraco engines ([1]) using Inconel superalloy ([2]) powder, which is even harder to process with a mill than titanium.<p>1. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;SuperDraco#Manufacturing" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;SuperDraco#Manufacturing</a><p>2. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Inconel" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Inconel</a>