The mission is to apply design methods and production processes to show the understanding. I designed her the sample or prototype of my final project. Well, if you can see in the above picture of testing the quality by changing different variables you could notes the variety of nut size which caused me the difficulty in scaling it with the screw. So, I had a problem in scaling the nut with the screws, which were too small to fit so I tried changing the scale of the object in Ultimaker Cura by making the difference between then just 5mm. In this case the nut can fit into the screw and spins softly.