⬢Take the larger printed part (s-buffer-printer) and place it like in the picture with two holes facing to the right.
Prepare something slightly heavy and tall (e.g. empty glass), we will use it in a second.
⬢Grab one plate and slide it in, it will fit in the slot.
⬢Make sure the surface facing towards you have the protective foil removed. If not, remove it.
⬢The entire assembly will have a tendency to fall over, use the prepared object to support it from behind.
⬢Slide another 5 plates in the printed part. Make sure the inner surfaces have the protective foil removed.
⬢Use two M3x40 screws and push them through the printed part. Ensure the screws are all the way through.
Don't turn the Buffer over yet.