You could have stopped at the last step and just printed out a normal pumpkin, but if you want to make it really scary then you can make it a creepy j...
This is a design for 123d design. You will need the app to get it. It's Halloween again! Time to start putting out decorations and stocking up on candy! This is a cheap, easy 3-d printable decoration of either a pumpkin or a jack-o-lanturn. The jack-o-lanturn is scary and will scare children away from your candy. Happy Halloween!
First, you only have to take a sphere and shape it to the oval in the picture. This is the inside of your pumpkin. Then take a torus and shape it to the size of the pumpkin. Put it around the pumpkin and duplicate it. Once it is duplicated, put the duplicate over the original and slightly rotate it. If you keep doing this then you will end up with the groves in the pumpkin like a real pumpkin.
Step 2: Color
Take whatever shade of orange you want your pumpkin to be and color all the toruses that color.
Step 3: The Stem
Take an L shape and shrink it. The stretch it up and color it the color of a pumpkin stem. Then you can put it on top of your pumpkin like in the picture.
Step 4: Remove The Center
Take a torus and move it to the side until you can see the center. Then hold the center sphere and delete it. Move the torus back to its original spot. This leaves you with a hollow shell shaped like a pumpkin. It conserves a lot more plastic being hollow and it a lot cheaper and lighter.
Step 5: Handle
Take a C shape and place it on the edge of the pumpkin. Color it brown so it looks nice with the orange. This is a handle if you make the pumpkin big, or a place to put it on your keychain if you make it small.