Computer-Aided Design in Additive Manufacturing

How 3D Modeling is Shaping Design.

By Raymond B. Kaniu

Raymond B. Kaniu is the Chief Executive & Chairman of Strähl Composite.

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Executive Summary

CAD software systems inform the manufacturers on how to produce a product. However, they have evolved to provide so much more for the end user. They can create realistic renderings for internal presentations and marketing collateral, link databases from disparate suppliers, assist in technical analysis and interference detection for assemblies, and automate processes. The removal of the human element from manufacturing is happening with 3D printing by shifting production from manual, multi-step human assembly lines to fully automated, digital processes. It reduces the need for human labor, removes the need for traditional tooling, and eliminates human error through exact, layer-by-layer digital replication. In as much as the human element is removed, it is thoroughly augmented in the process.

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Introduction

The process of creating physical objects from digital 3D models is called 3D printing, or additive manufacturing. It is a computer-controlled process that builds three-dimensional objects by depositing materials layer by layer. This process is distinct from subtractive manufacturing which cuts away from a solid block of material like a sculptor does with a chisel. On technical terms, additive manufacturing, as the name suggests, refers to building something up from scratch by adding different parts or elements like molding, but has become synonymous with 3D printing.

In the past, additive manufacturing was used to develop prototypes; renditions of the final product or projects for research and development, and graduated to its current functional use, catapulted by emerging 3D printing technologies using computer aided designs (CADs).

Computer-Aided Design (CAD) – The Software Aspect

This is the software that brings a design to a manufacture-ready state, and centralizes the software activities where designers and engineers translate concepts into three-dimensional models that will be eventually printed into physical form. It is a virtual environment that scans and interprets the uploaded design into a layer by layer framework that will be sent to the printer. This is what is referred to as slicing due to how the software cuts the model into multiple horizontal layers and generates the “G-Code” the printer will use to build the project. The printer takes that framework and begins the creation process, turning the digital framework into a physical framework.

CAD was first employed and coined in 1959 when a researcher at MIT developed a program that allowed his team to sketch electronic circuit drawings on a computer. It has evolved over the years into a virtual workspace that is cloud-based, enabling developers to collaborate on the same model through different workstations and delegate intensive algorithms such as generative design, simulation, and rendering, to the cloud. Advanced simulations allow testing of a design according to various mechanical aspects in a matter of hours. Generative design makes the computer a co-creator using artificial intelligence to suggest optimal shapes to meet specific mechanical problems. The benefits of CAD integration across the product development processes are rapid concept development, specialization, visualization, optimization, and rapid manufacturing.

CAD software systems inform the manufacturers on how to produce a product. However, they have evolved to provide so much more for the end user. They can create realistic renderings for internal presentations and marketing collateral, link databases from disparate suppliers, assist in technical analysis and interference detection for assemblies, and automate processes. CAD software systems are actually parametric systems of control depending on the manufacturer’s design to generate workable 3D models. Dimensional controls, from the least to most control, determine the type of modeling and design a specific CAD software will accomplish. It will most likely range from freeform modeling where the user draws shapes out of a base mesh object, modifying it freely without any numerical constraints to generative design, where complex models are computer-generated beyond the scope of vision of a human designer only. However, most CAD systems are currently hybrids because they contain aspects and tools borrowed from that broad spectrum.

3D Printing Technologies – The Hardware Aspect

Depending on the printing technology, the material used for printing may vary. Plastics like PLA, ABS, PETG, Nylon, and TPU are more attuned to the Fused Deposition Modeling (FDM)/ the Fused Filament Fabrication (FFF) methods. Due to the availability of these materials, the FDM/FFF methods are the most popular and less costlier. Other materials like resin, plaster, and metals can be printed through Stereolithography (SLA), which uses an ultraviolet (UV) laser or light projector to cure and harden liquid photosensitive resin or plaster, layer by layer. It is very useful for highly detailed printing. Alternatively, they can be printed through Selective Laser Sintering (SLS), which uses a powerful laser to fuse small particles of polymer powder together.

Additive techniques minimize waste, reduce lead times, and allow for highly complex, lightweight geometric designs. It has revolutionized product development, rapid prototyping, and on-demand production. It facilitates faster iteration and enables the creation of components that are otherwise difficult to create using traditional subtractive techniques like aerospace components, custom medical implants, and consumer goods that would be impossible to manufacture using conventional casting, molding, or machining. A chief limitation of 3D printing is that most parts are inherently anisotropic or not fully dense, meaning they usually lack the material and mechanical properties of parts made via subtractive or formative techniques. Cooling or curing conditions might also affect different prints of the same part, putting limitations on consistency and repeatability. To address those limitations, formative manufacturing techniques can be applied because they are designed to reduce the marginal cost of producing individual parts.

What are the applications

Because additive and formative methods remove the constraints of traditional tooling and subtractive methods, they are heavily relied upon across specific industries and has numerous applications and impact. The manufacturing industry is an obvious benefactor due to the rapid testing and reduction of early-stage financial risks. The healthcare and medicine industries benefit through bio-printing, custom-designed prosthetics, and surgical planning. Practitioners can print anatomical models to prepare for complex procedures, while amputees benefit from affordable, personalized prosthetic limbs. Automotive and aerospace industries leverage 3D printing to easily manufacture discontinued or limited-replacement parts. The construction industry is using 3D printing to offset labor costs and shortages while reducing material waste by printing faster and more economically than conventional methods. The applications are extended to curious and creative individuals who would like to explore the benefits of modeling and production of simple parts and household items. This is a niche well served by the 3D printing companies as more people become familiar with the technology.

Outlook

The shift towards cloud-based CAD solutions will enable greater collaboration flexibility, and accessibility, allowing users to work from anywhere and on any device. When you add artificial intelligence and machine learning to those systems, they will enhance design automation optimise processes, and provide intelligent insights to improve design quality and efficiency. As indicated in an earlier paragraph, CAD systems are acting as virtual work spaces. Therefore, the integration of augmented reality (AR) and virtual reality (VR) technologies will offer immersive design experiences by allowing users to interact with and visualize models more intuitively and realistically.

The removal of the human element from manufacturing is not only happening with humanoid robots, it is happening with 3D printing by shifting production from manual, multi-step human assembly lines to fully automated, digital processes. It reduces the need for human labor, removes the need for traditional tooling, and eliminates human error through exact, layer-by-layer digital replication. In as much as the human element is removed, it is thoroughly augmented in the process by allowing humans to focus on highly skilled aspects of manufacturing like managing, maintaining, and innovating the software and hardware systems that run the printers.

Works Cited

3D Printing Guide: Types of 3D printers, materials, and applications. (n.d.). Formlabs. https://formlabs.com/3d-printers/

Choosing the best 3D CAD software: a comprehensive guide. (n.d.). Formlabs. https://formlabs.com/blog/cad-software/

Linke, R. (2026, January 29). Additive manufacturing, explained. MIT Sloan. https://mitsloan.mit.edu/ideas-made-to-matter/additive-manufacturing-explained

What are the applications of additive manufacturing? (2024, July 2). Additure. Retrieved July 7, 2026, from https://additure.co.uk/additure-resources/what-are-the-applications-of-additive-manufacturing

Suzuki, E. (2025, July 18). How 3D printing has changed manufacturing. Autodesk. Retrieved July 7, 2026, from https://www.autodesk.com/products/fusion-360/blog/3d-printing-changed-manufacturing-world/

3D printing: What is it & how does it work?, Protolabs Network (formerly Hubs). (n.d.). 3D printing: What is it & how does it work? | Protolabs Network (formerly Hubs). Protolabs Network. https://www.hubs.com/guides/3d-printing/