This is the vertical portion of the Warp Core in the Enterprise from Star Trek the Motion Picture and Star Trek II: The Wrath of Khan. This piece was designed to go into the 1:350 scale Polar Lights USS Enterprise model kit specifically for a cutaway versionand is hollow so it can be lit! It has a 3mm hole going all the way through for LED lighting. The bottom of the Warp Core (short sections end) is meant to sit on the styrene peg sticking up from the bottom while the top end (the long section) will be in line with saucer seporation line (the red stripe) on the model. I also made the horizontal section of the Warp Core that runs through Engineering on Deck 15 to the Warp Pylons which I had to upload seporately. I used pictures from the movies and cutaway diagrams of the ship to make the models.
The model can be viewed in 3D at SketchFab here: https://skfb.ly/6YIRI
The cutaway images can be found here: https://www.cygnus-x1.net/links/lcars/sd-constitution-ncc-1700-rebuild.php