In recent years, 3D printing has grown to become a primary tool for prototyping and manufacturing. 3D printing methods, such as Fused Deposition Modeling (aka FDM), hold crucial importance for the development of products. Moreover, an array of industries, from the medical and automotive industries to robotics and consumer products, use this technique. Thus, if you have a particular complex product design or are looking to improve on an existing design, look no further.
FDM technology is capable of turning your ideas into working prototypes quickly. This enables you to test designs, make adjustments, and refine the designs to get ahead of the competition. Similarly, Fused deposition modeling is widely used because it is capable of printing quickly. Its prototypes have great precision and a lower manufacturing price. This process involves melting plastic filament, building your part layer by layer with that plastic in a precise manner. Besides, depending on the object you want to make, it is possible to have FDM parts in your hands in as little as a day.
In this article, we will define what FDM 3D printing is, describe the prototyping process, discuss the various material options, and offer suggestions on outsourcing your prototypes to reputable manufacturers. So, let’s start!
What is FDM 3D Printing?
Fused Deposition Modeling, or FDM, is an additive manufacturing process that creates 3D solid models. It is melting a material and combining it according to a specific path. Moreover, FDM is extensively used for visual and functional prototypes across numerous industries.
With an FDM 3D printer, you can rapidly produce parts from computer-aided 3D files. Consequently, the manufacturers convert a CAD design into a real-life physical product. FDM is one type of material extrusion process. Firstly, the printing software slices the 3D design into thin parts or layers. Subsequently, the printer assembles the object on the print bed in 3D, layering the successive slices following the paths.
Fused deposition modeling (FDM) utilizes thermoplastic polymer filaments as the raw material. These filaments melt while being printed and then solidify to form each layer of the final object. So, given its reliability and versatility, FDM has the most extensive installed base of all 3D printers worldwide. It is the most popular 3D printing method and the first that most people think of when hearing “3D printing”.
Main Components of a Typical 3D Printer
Before we get into how FDM works, let’s take a quick look at the main components of a typical FDM 3D printer:
- Filament Coil: This is the spool of material that will be used for printing. Moreover, the filaments used in FDM are special 3D printing-grade thermoplastics, not regular plastic.
- Extruder: The extruder pulls the filament from the coil, melts it, and pushes it towards the nozzle.
- Nozzle: The nozzle releases melted filament onto the print bed. Besides, it can move carefully along the X, Y, and Z axes to form the final model layer by layer.
- Print Bed: This is the surface on which the object is printed. The print bed is flat and generally non-stick, holding the Model stable while the printer prints.
How Does FDM 3D Printing Work?
An FDM 3D printer creates objects by depositing melted thermoplastic filament in layers on a build platform. It converts digital design files into physical parts, layer by layer, following a methodical process. Here is the process:
Creating the 3D Model
The process begins with establishing a 3D model with software like AutoCAD, Fusion 360, or SolidWorks. This allows the designer to have multiple views of the Model and provides dimensional capabilities. Moreover, the design must include all dimensions and details to build correctly. Subsequently, we save it in a file type input to the printer (.STL or .OBJ).
Preparing the File for Printing
Next, slicing software separates the Model into thin slices and forms the program. The G-code program is a set of instructions that the printer interprets details of its path, layer thickness, speed, and temperature.
Loading the Filament and Printer Setup
Load a spool of thermoplastic filaments, such as ABS, PLA, PETG, or PEI, on the filament coil of a 3D printer. However, it’s crucial to ensure the print bed and nozzle are correctly aligned before starting the print.
Heating and Extruding
The printer heats the filament to the proper temperature, melting it as it feeds through the extruder and nozzle. Subsequently, the extruder continuously feeds the molten filament through the nozzle.
Layer-by-Layer Building
The printed filament is deposited from a nozzle called an extrusion head. The nozzle is attached to a movement system that moves in the X, Y, and Z axes and contains the melted filament into thin strands (typically .1 to .3 mm). The printer follows a G-code path to fill each layer. After the printer successfully prints one layer, the build platform goes down (or the extrusion head moves up), and the printer begins printing the next layer. As a result, this layering continues until the formation of the object is complete.
Cooling and Solidifying
Once deposited, the material cools and solidifies. Some printers have fans attached to the extrusion head to improve the speed of this cooling and solidification process.
Post-Processing
After printing, the part typically needs a finishing step, such as sanding, painting, or vapor polishing. Each of these processes achieves a similar goal: improving surface smoothness and enhancing aesthetics.
Advantages of FDM 3D Printing for Prototyping
FDM technology utilizes thermoplastics that are commonly used in traditional manufacturing. Thermoplastics provide tight tolerances, toughness, and high environmental stability. Therefore, these attributes lend themselves to FDM being a good process for making parts. Additionally, FDM is a mature, clean, and user-friendly method. Manufacturers can use it on an office site and in various other work environments. Also, FDM can create complex shapes and cavities that are not easily made. This helps reduce the need for assembly. FDM is quick to produce and has a low cost. Furthermore, it provides accuracy and easy customization. Here are some additional advantages of FDM 3D printing:
Low Prototyping Costs
Fused deposition modeling (FDM) is more economically favorable than other 3D printing methods. Filament materials generally cost less than powders or resins of different technologies. Similarly, tooling costs are also relatively low, and you can easily adjust printing parameters in terms of time and material usage.
Complex and Detailed Prototypes
FDM fuses layers exactly to create sophisticated geometries containing multiple components. It can print parts with thin walls, overhangs, interlocks, hollow structures, complex contours, and textured surfaces, minimizing assembly as a requirement.
Fast Lead Times
FDM printers operate quickly, delivering prototypes for uncomplicated projects in as little as 1 to 3 days. Besides, this speed enables multiple iterations, essential for gaining a competitive edge.
Variety of Color Options
You can purchase filaments in many colors. The marketplace has a wide range of colored filaments to choose from. Besides, some users mix filament colors for unique prototype appearances.
Material Versatility
Fused deposition modeling (FDM) makes printing thermoplastics, metal filaments, and composites easy. The most common filaments include PLA, including biodegradable bio-PLA, acrylonitrile butadiene styrene (ABS), Nylon, polycarbonate (PC), polyethylene terephthalate glycol (PETG), carbon fiber, bronze, copper, stainless steel, and iron-filled filaments. However, when switching between printing with plastics, metals, and composites, be aware that they will need different printer setups.
Standard Materials for FDM 3D Printing
Thermoplastics have the broadest application in FDM 3D printing. However, you can explore composites, metal-filled filaments, and other specialty materials based on your functional testing requirements. One of FDM’s primary advantages -whether performed on a desktop or industrial printer -is its versatility in material compatibility.
These include:
- Commodity Thermoplastics: Such as PLA and ABS
- Engineering Thermoplastics: Like PA (Nylon), TPU, and PETG
- High-Performance Thermoplastics: Including PEEK and PEI
Desktop FDM Printing Materials
PLA filament is the most commonly used filament for desktop FDM printers. It prints easily, produces parts with fine detail, and has low warping. PLA is also biodegradable, so it is environmentally sound. Besides, when parts need to be stronger or more ductile and have better thermal stability, ABS is a popular alternative. However, ABS also warps more, especially if you don’t have a heated chamber.
Another widely used desktop material is PETG. Like ABS, PETG combines strength and chemical resistance but is easier to print. For most desktop 3D printing (and that encompasses everything from concept models to functional prototypes to low-volume production), you have the three: PLA, ABS, and PETG.
Industrial FDM Printing Materials
Engineering thermoplastics such as ABS, polycarbonate (PC), and Ultem are usually employed as the principal types of printing material in industrial FDM machines. However, these are commonly made with additives to enhance various material properties, such as impact strength, thermal resistance, chemical resistance, and biocompatibility, which are important characteristics for an industrial application.
Common FDM Filament Materials and Their Uses
| Material | Key Characteristics | Common Applications | Printing Considerations |
| PLA | Easy to print, biodegradable, low warping, smooth, and glossy finish | Concept models, visual prototypes, toys | Low printing temperature, minimal warping |
| ABS | Strong, impact-resistant, heat-resistant, slight flexibility | Functional parts, enclosures, and automotive prototypes | Requires a heated bed, prone to warping, emits fumes, ventilation. |
| PETG | Strong, chemical-resistant, good layer adhesion, semi-flexible | Mechanical parts, snap-fits, containers | Easy to print, less warping than ABS, suitable for outdoor use |
| TPU | Flexible, elastic, abrasion-resistant, soft, and rubber-like feel | Grips, seals, wearable prototypes | Requires slower print speeds and careful bed adhesion |
| Nylon | High strength, durable, wear-resistant, slightly flexible | Functional gears, hinges, and load-bearing parts | Sensitive to moisture, needs high print temperature |
| Polycarbonate (PC) | Very strong, heat-resistant, impact-resistant, and transparent | Protective covers, industrial parts, and lighting fixtures | Requires high nozzle temperature and a heated chamber |
FDM 3D Printing Vs Other 3D Printing Types
In addition to FDM, several other 3D printing techniques are crucial for prototyping. Each of them has its unique strengths and weaknesses when it comes to producing prototypes:
Selective Laser Sintering (SLS)
SLS uses a focused laser beam to selectively fuse polymer powder layer by layer. The laser sintered the powder in the powder bed, combining it into a solid structure to which the layer above it is bonded. All layers are sintered together; therefore, parts made through SLS are robust and durable. In short, SLS is very advantageous for functional prototypes or as very accurate models for visual display. Besides, the beauty of SLS is the ability to build anything. Parts can be as complex as required and do not require a support structure; SLS will build any geometry!
Direct Metal Laser Sintering (DMLS)
DMLS is frequently used for rapid prototyping in industry. It uses laser-focused energy to fuse metal powder and, as such, can use CAD data to produce parts. It can create extremely complex geometries that introduce complexities to FDM files, making it impossible. However, DMLS is limited to only metals and alloys and is best suited for functional metal prototypes or small production runs for parts that need to be metal.
Stereolithography (SLA)
SLA is the curing of liquid resin with a laser, and through that process, it makes a solid model one layer at a time. The end product of an SLA print is known for its smooth surface finish and excellent dimensional accuracy. Thus, SLA is ideal for visual models, detailed prototypes, and applications where resolution is critical.
Contact Premium Parts for FDM 3D Printed Prototype Needs
High-quality prototypes for testing and design validation can sometimes be difficult. And it becomes more complex when you do not have an in-house 3D printing setup. Luckily, Premium Parts offers custom prototyping services for designers and companies. Besides, we provide 3D printing services using a range of technologies, including FDM, SLS, SLA, etc. Moreover, our expert team can turn your creative ideas into physical prototypes faster than you can imagine.
In addition, we assist you in the materials selection process and design optimization. We also have quality assurance in place to guarantee that every prototype you receive meets strict manufacturer standards. So, no matter how complex your design is, we can realize it accurately. Furthermore, we respect the time constraints imposed on your product development and deliver promptly.
Final Verdict
FDM 3D printing can be effective for metallic and non-metal prototypes, but is typically more applicable for non-metal materials. FDM can promptly create elaborate three-dimensional shapes directly from CAD models. Moreover, before the design and prototype process, designers should evaluate expectations regarding empirical design optimization, material type, and any other specifications for the prototype. Considering all the factors, FDM would be the best fit for prototype fabrication from a cost, quality, and lead time perspective.
FAQs
How Accurate and Durable Are FDM 3D Printed Prototypes?
FDM 3D-printed prototypes’ accuracy varies depending on a myriad of factors, but it is usually around ±0.5% of the model’s size. For instance, ±0.05 mm of accuracy for a 10 mm length. In addition to accuracy, FDM parts are known to have strong build quality and durability. This makes them usable for many testing purposes and functional applications.
What Are the Main Benefits of Using FDM 3D Printing for Prototyping?
FDM technology offers some advantageous features, making it the choice for many prototyping solutions. Its feedstock materials, as well as processing costs, are relatively lower. Moreover, the fast production rate means fast iterations and testing are available. Making changes to print parameters for prototyping is often very easy. Additionally, there’s a selection of thermoplastics and composites to consider and try.
What Are Common Issues with FDM Printing, and How Can They Be Solved?
Here are the typical challenges in FDM printing:
- Material may warp and cause parts to warp or deform while printing. So, some of the best ways to minimize warping are to control the print temperature as much as possible. You can use heated print beds and enclose the printer.
- Filament stringing leaves thin strands between your parts. You can minimize the stringing by adjusting the retraction options and optimizing the print speed.
- The layers can separate while under stress. Calibrating the extrusion temperature and using quality filament can improve layer adhesion.
In conclusion, regular cleaning and maintenance of the printer’s components are paramount to avoiding these issues and achieving consistent print quality.
