The cost of a 3D design model will vary depending on the complexity of the project. Generally, simpler models will cost less while more complex models will cost more. The size of the project will also affect the cost – larger projects will typically be more expensive than smaller projects. Additionally, the level of detail and accuracy required for the model will impact the cost. More detailed and accurate models will be more expensive than less detailed and accurate models. Ultimately, the cost of a 3D design model will be determined by the specific requirements of the project.