HTC is using the BCN3D Sigma 3D printer during the Mobile World Congress 2017 for materializing virtual reality designs created with the HTCVive VR headset.
https://www.bcn3dtechnologies.com/en/htc-vive-is-using-the-new-bcn3d-sigma-r17-on-the-mwc-for-materializing-virtual-reality-designs/