Key Players (this may not be a complete list and extra companies can be added upon request):
3D Systems Corporation
Arcam AB
Desktop Metal
EOS GmbH Electro Optical Systems
ExOne Co.
FlashForge Corporation
Formlabs Inc.
Hewlett-Packard Inc.
Leapfrog 3D Printers
Markforged
Materialise NV
Mcor Technologies Ltd.
Printrbot
Proto Labs Inc.
Robo 3D
Shining 3D
SLM Solutions Group AG
Stratasys Ltd.
Tiertime Corporation
Tinkerine Studios Ltd.
Ultimaker BV
XYZprinting Inc.
Zortrax