calibrating cube

hi guys

i created the calibration cube and share if you guys like
reason why i create this is because to determine the shrinkage effect of 3d printed object.

the cube is 30mmx30mmx30mm
and there are a shell 10 mm and hole which is 6mm and 3mm
pole 6mm and 3mm
and some overhang

please share if you make one for further improvement !
enjoy !