I'm tired of printing 20x20 squares for calibration, only to throw them away after use.

So, I decided to make a square that can also be used as a connecting block. Because my son likes to make small robots with the squares we bought. The size of this square is 19.20 x 19.20 x 19.20

I printed and tested it several times. The size is very accurate and it matches the actual connection block very well.