Final answer:
When designing an object that needs to be very flexible, materials like semi-flexible polymers and polymer gels are recommended.
Step-by-step explanation:
When designing an object that requires high flexibility, the material selection is crucial for the product's functionality. For 3D printing applications where flexibility is key, several materials are suitable.
Semi-flexible polymers are often a good choice because they offer a balance between flexibility and strength. These materials can withstand bending and twisting forces without permanent deformation. Similarly, polymer gels can be used when a soft, flexible structure is needed, such as in medical devices or wearable technology.
Furthermore, materials with elements of elasticity, such as those found in biopolymers like collagen, possess the ability to stretch and return to their original shape, mimicking the properties of natural tissues. Another consideration is the adhesion of vesicles and capsules, which involves the ability of the material to adhere to other surfaces or encapsulate materials, providing additional functionality.
An example of a suitable 3D printing material for creating flexible items is low-density polyethylene (LDPE), which is highly branched, allowing for more flexibility. LDPE is used for items like beach balls, which are inflated and thus need to be very flexible.