R&D Headquarters
Keycard
Switched off at first: it appears in the hatch of the 3D printer once the grid is solved. It goes in the keycard reader by a door on the laboratory floor.
What it is for
Puzzle page: 3D Printer Grid
Where the walkthrough uses it
2-3 Dahne’s Laboratory· step 7both players
The small player solves the floor grid, then the big player takes the keycard from its hatch.
2-4 Experimental Prototypes· step 1both players
Put the keycard in by the lab door and pull the left and right chains together. The prototype room opens and the lab door locks behind you.
Where to find it
No item spot is random: the game files place every item in the same spot in every game. Some items exist several times at once, such as the fuses in the Time Maze. From the game files: the area is loaded at these checkpoints. A door on the way can still be locked at some of them.
How to find it
It is not there at first. Once the 3D printer grid is solved, it appears in the printer’s hatch: the machine beside the wheeled whiteboard, near the plants.
5 mSeen from above with the ceiling removed. Yellow ring: this spot. Small labels: other spots of the same item close by (select one to go to it). 
The spot seen from nearby (rendered from the game's own level geometry).
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