Both sides of the square are on a single plate, use a 0.2mm nozzle otherwise the markings will not print properly.

Find the original model on OnShape.

Feel free to use it and modify it. It would be greatly appreciated if you share back the modified version.

https://cad.onshape.com/documents/dd743c78b064b39d83ac3635/w/f48992064ab563a41d13c061/e/66d7cfaf08a4c7ece2dcac8c?renderMode=0&uiState=6633a9adc1f14519302eb484

The pivot can be removed on OnShape.