This chap does some very interesting 3d printing work including things like a tesla turbine tesla valves a pulse jet and rockets and for his most recent video he made a 3d printed (or at least partially 3d printed) functioning turbojet engine (functional briefly but functional none the less)
Obviously the materials you can print with hobbyiest 3d printers is not usually up to the temperatures you would need to withstand in a functional turbojet (commercial metal printing could do this sort of thing and there are ceramic resins you can 3d print but they have some drawbacks) but I like the clever use of the tech to get round the various limitations like using 3d printed press and die to form a metal compressor fan and using fireplace cement in 3d printed molds to form the shaft supports and diffuser plus various jigs to make the metal forming parts of it work.
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The look on his face when it's self sustaining is awesome. Strap the fucker to a primary glider and let's get that bitch airborne.
Fantastic video, thanks for sharing.