⬢Take the larger printed part (s-buffer-printer) and place it like in the picture with two holes facing to the right.
⬢Grab one plate and slide it in, it will fit in the slot.
⬢Make sure the surface with previously removed protective film is facing towards you.
⬢Slide another 5 plates in the printed part. Make sure the surfaces with previously removed protective films are facing towards you.
⬢Use two M3x40 screws and push them through the printed part. Ensure the screws are all the way through.
Don't turn the Buffer yet.