First off you'll need to find the PS VR-Headset Artefact inside of the level "MT. Motherboard" inside of GPU Jungle.
Then go to Playstation Labo and stand in front of the lens of the VR headset and press square.
Here's a guide to find all puzzle pieces and artefacts:
https://www.pushsquare.com/guides/astros-playroom-guide-tips...