4

It's nowhere as deep as the garage door notches they designed to let the doors slide up and down.

How does the notch fit into the initial set that the part was first introduced and does this shallow groove have specific function?

the piece in question

For reference, this is "Plate, Modified 1 x 2 with 4 x 4 Dish at 90 degrees" (30209).

7

As far as I know, it's not intended to have any building function, it's just there to prevent any excess plastic at the fill hole from getting in the way of other pieces.

I can't find a good close-up picture, but that particular piece is filled through a hole in the mold at that location, which you can kinda see in this picture.

enter image description here

Without the small recess, if the sprue were to leave behind a small nub, it could prevent sticking the piece next to another piece.

  • 1
    Huh, I just cracked into 40311 Traffic Lights this week and noticed a very similar notch in the base of the signpost (Tile, Modified 2 x 2 with Bar and Stud with Stop Ring). I guess it serves the exact same purpose. – LegoSonicBoy Nov 30 '18 at 17:49

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