My daughter had to make "3D models" for her science class. Naturally, she decided to go the 3D printing route.
We designed the volcanoes in Fusion 360, printed them -- and then she used a Creopop to fill in the lava.
(Yes, the Creopop plastic did stick to PLA.)
The Composite Volcano is my favorite -- though it could use a little trimming/cleaning.
Yes, I suspect my daughter will be 'that' kid.