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/
PLA, low cost, good heat resistance, good finish, has odor and heavy warping when printing,
ABS, low cost, good strength, not durable, not outdor, low heat resistance
Flex, TPE or TPU, felxible, durable, difficult to print, less strength
Carbon can be added to PLA and ABS to increase strength
PETG, Nylon, Polycarb, Polyprop
Hazards: fine particles, VOCs
Objet printers: https://www.stratasys.com/3d-printers