This original model by tc_fea was one of the many things that drove me on to make another 3D printer, it's great and I always wanted to make a complete shell.
So this is a 2.5X scales version with both sides.
This was also an experiment for me with using a small fan blowing across the build platform (Still use a heated bed) - if you look at the picture with the inside prints, you can see the effect of having a fan or not, on one half the inside is more loose then the other, it didn't make a difference to the outside but you get the idea.
Scale if needed to be smaller (Or BIGGER !), print and stick together.
This was printed at 60mm/sec with 2 extra 'shells'(Get it) and 0% infill
Admire your achievement and maybe help save the planet.
Give it to a hermit Crab for Project Shellter, this one could fit a small whale!
Check out the project -