Metal Injection Molding
See explanation of the process.
https://airwolf3d.com/2018/02/16/metal-printing-mdm-2018/
Airwolf is working with BASF - Airwolf has a MIM filament?
DIY
- Make your own stainless steel powder with polystyrene/palm kernel oil binder - [1]
Links
- MIM Pellets - don't exist off-shelf?