Varying density of a model for manufacturing a liner

1. A method comprising:

receiving data representing coordinates of a shape of a body part;

forming a model of a flexible inner liner based upon the received data, the flexible inner liner configured to be placed over the body part;

receiving, as input, a thickness and an offset of the model of the flexible inner liner;

assigning a default uniform density to an internal structure of the model;

varying the default uniform density of the model in at least one area of the model without changing the thickness of the model to create a modified model of the flexible inner liner having a non-uniform density, the thickness defined by a distance between an outer surface and an inner surface of the model, wherein the at least one area of the model has a density that different than a density of a remaining area of the model, and a structural configuration of the at least one area of the model includes a plurality of repeating structural elements that are spaced apart from each other by a distance, each repeating structural element extending from the inner surface to the outer surface of the model; and

converting the modified model into machine readable instructions based on a language for manufacturing the flexible inner line by a 3D printer.

2. The method of claim 1 , wherein the flexible inner liner is disposed between the body part and a hard outer layer.

3. The method of claim 1 , wherein the distance between the outer surface and the inner surface is unchanged as a function of the default density being varied.

4. The method of claim 1 , wherein the structural configuration is modified as a function of the varying.

5. The method of claim 4 , wherein the structural configuration is modified by varying a number of the plurality of repeating structural elements extending between the inner surface and the outer surface of the flexible inner liner.

6. The method of claim 1 , wherein the plurality of repeating structural elements are one of sinusoidal wave elements and triangular wave elements.

7. The method of claim 1 , wherein a material of the model is not varied as a function of the varying.

8. The method of claim 1 , wherein the data representing coordinates of the shape of the body part is at least one of: received from a scanner that is configured to scan at least one of the body part and a physical mold of the body part, and received as input from a user that manually measures the body part or the physical mold.

9. The method of claim 1 , further comprising: controlling the 3D printer with the machine readable instructions to manufacture the flexible inner liner.

10. A computing system comprising:

a processor configured to:

receive data representing coordinates of a shape of a body part;

form a model of a flexible inner liner based upon the received data, the flexible inner liner configured to be placed over the body part;

receive, as input, a thickness and an offset of the model of the flexible inner liner;

assign a default density to an internal structure of the model;

vary the default uniform density of the model in at least one area of the model without changing the thickness of the model to create a modified model of the flexible inner liner having a non-uniform density, the thickness defined by a distance between an outer surface and inner surface of the model, wherein the at least one area of the model has a density that different than a density of a remaining area of the model, and, as a function of a varying of the default uniform density, a structural configuration of the at least one area of the model includes a plurality of repeating structural elements that are spaced apart from each other by a distance, each repeating structural element extending from the inner surface to the outer surface of the model; and

convert the modified model into machine readable instructions based on a language for manufacturing the flexible inner line by a 3D printer.

11. The computing system of claim 10 , wherein the structural configuration is modified as a function of the varying.

12. The computing system of claim 11 , wherein the structural configuration is modified by varying a number of the plurality of repeating structural elements extending between the inner surface and the outer surface of the flexible inner liner.