2 - oreo_solid.stl or oreo_cookie.stl [black] (Print with fuzzy skin on the outside, 0.2mm skin thickness, 0.1mm point distance for Prusaslicer)
1 - oreo_filling.stl [white]
1 - oreo_thread.stl [white]
2 - (not required if printing with oreo_solid.stl) oreo_base_cover.stl [black]
oreo_solid will be a lot easier to print but will result in slightly less volume.
All the parts will take a little more than 2 days to print at 60mm/s.
Superglue oreo_filling and oreo_thread to the oreo cookies.
If printing with oreo_cookie.stl instead of oreo_solid.stl, superglue the oreo_base_cover.stl to the inside of each oreo_cookie to cover up the ugly bridging required to print the oreo_cookies.
I do not recommend scaling the model up/down too much due to the tolerances in the threads. The model .blend file has been included for you to modify.
The author remixed this model.
Made the oreo a jar.