PLTW CIM Activity 2.1.2 Inventor Parts

These are the 4 parts needed for the Activity 2.1.2 Mass Properties Analysis for the Computer Integrated Manufacturing Class of Project Lead the Way. I have attached the 4 Inventor part files, their respective STL files to be produced on machining equipment, and 4 screenshots of their material properties. These are Inventor 2019 Part files which will not open on older versions of Inventor, so I attached STEP files to use those instead. Apologies if you find the file name formatting odd, I just p