First print the pumpkin shell. This model has a bottom and can take a led tea light or be filled with candy.
For the inside, you can choose to print as one piece with a flexible filament (TPU). If you print the one piece inside with PLA, or something not very flexible, you won't be able to get it inside the shell. There is an inside front, and inside back that will slide in when printed in PLA. You may need to glue these in place.
You will need support for the mouth and teeth. Be careful when removing support or your pumpkin will be missing teeth.
Measures: ~160mm (6 ¼") x 140mm (5 ½") x 0.86mm (1/32"). The top of the pumpkin is ~100mm (4")
The author hasn't provided the model origin yet.