How to build a large intestine model

Written by amy lea
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How to build a large intestine model
The key to a realistic looking large intestine is cooked spaghetti noodles. (egg crude macaroni image by Alina Goncharova from

A science fair project that wows the judges is what every student wants. A realistic looking large intestine model is a perfect choice for originality and creativity in a science fair project. Having extensive knowledge about what the large intestine is designed to do in relation to the digestive system of the human body, along with a realistic looking gut laid out on the table, will impress the judges.

Skill level:

Things you need

  • Clear hog casing, 38 to 42mm
  • Large bucket
  • Cooked spaghetti noodles
  • Vegetable oil
  • Red food dye
  • Kitchen knife
  • 6-inch PVC pipe
  • Rubber gloves
  • Garbage bag

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  1. 1

    Soak the hog casing for 24 hours. This allows for the sausage casing to become soft and pliable.

  2. 2

    Cover the sink with the garbage bag and put on the gloves.

    How to build a large intestine model
    Rubber gloves will keep your hands stain-free while building the large intestine model. (medical gloves image by sasha from
  3. 3

    Mix red food dye into the spaghetti noodles. Add as much colouring as desired. It is best to wet the noodles with cold water to make sure they slide and don't stick.

  4. 4

    Using the kitchen knife, cut 6 feet of casing. Tie a knot into one end.

  5. 5

    Wrap the open end of the casing over an end of the PVC pipe. Make sure enough of the casing is over the pipe so it will not slip off during stuffing. At least 4 inches should work.

    How to build a large intestine model
    Bunch the end of the casing over the lip of the PVC pipe end for a more secure hold. (coude en pvc de 45° (2) image by Marie-Thérèse GUIHAL from
  6. 6

    Fill the casing with the wet, red spaghetti. The casing will only stretch so far. The 38 to 42mm casing will expand to a 1 to 1 1/2 inch wide intestine.

  7. 7

    Place the intestine so that it looks like it's piled upon itself. This makes it look like real intestines.

Tips and warnings

  • If the spaghetti is not easily sliding down the casing, pour water in at the same time as adding the spaghetti noodles. This will help the noodles to slide down. Drain the water with each handful of spaghetti.
  • The large intestine in an adult is 5 feet long. It is known as the large intestine for its thickness, 1 1/2 inches, rather than its length.
  • The food dye will permanently stain skin and sinks. Always protect the equipment used with plastic covers such as gloves and garbage bags.

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