Apple, shelled, reference part for life cycle assessment

This file is a reference part to compare the environmental impacts of manufacturing with many different 3D printers, and some CNC mills. Creating the same part enables fair comparisons of printers with widely varying materials, print times, print quality, etc. If you wish to measure the energy use, material waste, and other impacts of your 3D printer, you are welcome to use it and compare to academic studies of nearly a dozen other machine and material combinations.

The part is a thin-walle