About this 3D model

This model was made for testing a tighness of M3/M4 screws in holes of my 3D printed models. Holes have diameters from 2,6 to 4,3 mm. I found out that ideal hole diameter for M3 screws is 2,9-3,0 if you want the screw to be tight in, but every 3D printer has it own deviations.