Clever these Chineese.
I saw this some years ago and thought it was an April Fool. I can imagine it for smaller parts some are shown in the article. some may remember the Dunlop sintered metal we used in the 70s/80s for flame traps on aircraft. These started out as powder but when heated, fused into something strong
When I worked in the rubber industry my company pioneered a method of laser printing paper moulds that were ok for low temperature. but at low temp and pressure the cure time was several hours. We had good results for complex prototype seals (car doors for Jag X200 in around 1998).
How sad that we don't have the S&T investment in the UK these days.