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Hi
The forum have questions about how to remove the seat belt
To do this, you needed a special key that only Tesla has
I found a service manual that explained in detail how to do this, this key was shown there.
I took a screenshot, translated it all into a STL, and printed the key on a 3d printer.
Printing was done with PLA plastic with 100% fill.
To remove, you need to gently (this is a plastic key, but should be steel) insert the key and while holding it insert the hexagon on the side and also push it