https://www.aim3d.de/
http://www.fabbaloo.com/blog/2018/1/2/aim3ds-most-interesting-3d-metal-printing-concept
PollenAM
https://www.pollen.am/pam-series-m
Airwolf3D
https://airwolf3d.com/2018/02/16/metal-printing-mdm-2018/