Super exciting tech. However, looking at the abstract: "Metal AM is mostly achieved via powder bed fusion and directed energy deposition processes [...] but su

Super exciting tech. However, looking at the abstract: "Metal AM is mostly achieved via powder bed fusion and directed energy deposition processes [...] but such laser-based processes struggle to produce materials such as copper." Please define struggle. Especially with SLM, 3D printing copper is reliable and is offered by essentially every SLM machine maker, with DED being also capable of mixing multiple materials and printing copper + steel. (Though at worse precision) Both SLM and DED require a completely new set of parameters on those machines, that sometimes have to be custom developed for tricky work pieces, but it's no less reliable. For special cases you can also preheat the substrate with induction heating to prevent effects caused by rapid cooling. Of course, these are all completely different use cases and precision scales we are talking about, but I still think the words chosen to depict SLM and DED are a bit harsh.