What is Fused Deposition Modeling (FDM) 3D Printing?

Fused Deposition Modeling (FDM) is one of the most widely used and accessible 3D printing technologies, known for its affordability, versatility, and ease of use. This process builds objects layer by layer by melting a thermoplastic filament and extruding it through a heated nozzle onto a build platform, where it solidifies to form the final shape. FDM is widely used by hobbyists, makers, product designers, and engineers due to its cost-effectiveness and material variety. It’s the same technology found in at-home 3D printers and large-scale print farms, making it one of the most recognizable and scalable methods of 3D printing. Over the years, advancements in consumer FDM printers—popularized by brands like Bambu Lab, Prusa, and Creality—have lowered the barrier to entry, making maintenance and troubleshooting easier than ever before. With print-on-demand services, FDM printing is now more accessible and reliable, allowing users to create high-quality, functional parts without owning a 3D printer.

What can you print with FDM?

FDM excels at creating strong, functional parts for both prototyping and everyday use. Some of the best applications include:

Functional Prototypes & Mechanical Parts

Durable, real-world testing parts for engineering and product design.

Props & Cosplay Accessories

Large, lightweight, and affordable prop-making materials.

Home Decor & Utility Items

Custom storage solutions, organizers, and home accessories.

Tabletop Gaming & Articulated Models

Print miniatures, game pieces, and flexible models with moving parts.

Consumer Products & Custom Gadgets

Affordable, customizable solutions for personal or commercial use.

If you’re looking for a cost-effective way to prototype, build functional parts, or create unique objects, FDM is the perfect choice.

Materials

ABS

Tough & Impact-Resistant

A strong, heat-resistant material great for:

  • Mechanical parts, enclosures, and functional prototypes
  • Durability and impact resistance
  • Can be post-processed with acetone vapor smoothing
Polyethylene Terephthalate

Food-Safe & Versatile

Commonly used for:

  • Consumer product prototypes and packaging models
  • Food-safe applications
  • Recyclable and chemical-resistant
Acrylonitrile Styrene Acrylate

UV-Resistant & Weatherproof

Similar to ABS but with enhanced resistance to sunlight and weather, ideal for:

  • Outdoor components, signage, and automotive applications
  • Great mechanical strength and impact resistance
  • Fade-resistant in prolonged UV exposure
PETG

Flexible & Chemical-Resistant

An easy-to-print, semi-flexible material that balances strength and ease of use:

  • Ideal for wearables, medical applications, and protective casings
  • Resistant to chemicals, moisture, and temperature variations
  • Less brittle than ABS, more durable than PLA
PLA

Easy to Use & Versatile

A user-friendly material great for:

  • Everyday prototyping, figurines, and creative projects
  • Wide range of vibrant colors and finishes
  • Biodegradable and low-odor printing

Design guidelines

Bounding box
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The bounding box is a 3D imaginary outline of a box that encloses the smallest area occupied by your model. Your model must be within the minimum and maximum bounding box sizes. If the size of the model is close to the maximum bounding box, then the printing orientation will be restricted.

Max. bounding box

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Min. bounding box

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Walls
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A supported wall is connected at least on two sides of the wall, while an unsupported wall is connected only on one side of the wall. Walls that do not meet the minimum requirements may not survive printing and cleaning processes. Additionally, models may still be rejected based on the wall geometry of the model. Please consider the size of your model and reinforce the walls or add support structures as needed as minimum guidelines will not always be adequate for large models.

Supported walls

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Unsupported walls

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Wires
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A wire is a circular, rectangular or even triangular feature that is thinner in its unconnected directions than its length. A supported wire is connected at least on two sides of the model, while an unsupported wire is connected on one side of the model. Wires that do not meet the minimum requirements may not survive printing and cleaning processes. Additionally, models may still be rejected based on the wire geometry of the model. Please consider the size of your model and reinforce the wires or add support structures as needed as minimum guidelines will not always be adequate for large models.

an icon depicting guidelines for supported wires
Supported wires

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an icon depicting guidelines for unsupported wires
Unsupported wires

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Details
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For text, the ratio between width and depth, should be 1:1 and sans-serif fonts are preferred for line weight consistency.

an icon depicting guidelines for embossed details
Embossed Details

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an icon depicting guidelines for engraved details
Engraved Details

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Clearance
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Clearance is the space between two individual parts in a model. If the space among the individual parts do not meet the minimum clearance, then parts can fuse together or can be difficult to clean. This is important for movable pieces like hinges, gears, etc.

Minimum

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Sprues
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Sprues are wires that keep two or more parts together. Parts should be connected with a minimum of two sprues each. Please consider the size of your sprues and increase them as needed as minimum guidelines will not always be adequate for large models. If the sprues are within the guidelines and are broken, but there is no damage to your model, we will still ship them as is.

an icon depicting guidelines for sprues

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Interlocking & Enclosed parts
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The bounding box is a 3D imaginary outline of a box that encloses the smallest area occupied by your model. Your model must be within the minimum and maximum bounding box sizes. If the size of the model is close to the maximum bounding box, then the printing orientation will be restricted.

Interlocking

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Enclosed

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Escape holes
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A wire is a circular, rectangular or even triangular feature that is thinner in its unconnected directions than its length. A supported wire is connected at least on two sides of the model, while an unsupported wire is connected on one side of the model. Wires that do not meet the minimum requirements may not survive printing and cleaning processes. Additionally, models may still be rejected based on the wire geometry of the model. Please consider the size of your model and reinforce the wires or add support structures as needed as minimum guidelines will not always be adequate for large models.

Single Escape hole diameter

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Multiple Escape hole diameter

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Accuracy
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The bounding box is a 3D imaginary outline of a box that encloses the smallest area occupied by your model. Your model must be within the minimum and maximum bounding box sizes. If the size of the model is close to the maximum bounding box, then the printing orientation will be restricted.

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