This is not for printing but for use in Prusa Slicer so you can have a cutaway model of the Neptune 2 and a custom bed texture.
After downloading the files. Open Prusaslicer and go to Printer Settings→Bed Shape→set.
The platform texture was just a simple design by myself in Inkscape.
For the 3d model, I took the cad files from Elegoo's site and removed all the interior pieces and only kept the pieces I needed. I then loaded it into blender and sliced the top and reduced the polygon count to lower the file size.
The author hasn't provided the model origin yet.