https://en.wikipedia.org/wiki/3D_printing
Requires post printing heat treatment: annealing at high temperature
Example part https://gpiprototype.com/metal-3d-printing#prev
https://www.3dhubs.com/knowledge-base/introduction-metal-3d-printing/
Setting up the printer: https://www.instructables.com/id/3D-Printing-Hacks/
Filament Materials https://www.prusa3d.com/material-guides/
Hazards: fine particles, VOCs
Objet printers: https://www.stratasys.com/3d-printers