Fused Deposition Modeling (FDM)

Mack Prototype creates tough, durable, and accurate prototype and production parts using thermoplastic materials.

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What is Fused Deposition Modeling ?

Fused deposition modeling (FDM), a process also known as fused filament fabrication (FFF), is best used for small to large prototype parts, jigs, assembly, check fixtures, and end-use production parts. FDM or FFF is the most common additive manufacturing technology. It uses thermoplastic filaments to create objects from engineered materials like ABS, PC, and Ultem™. Parts are typically rougher with heavier build lines but durable and accurate.

Fortus 400mc Large

  • Has the ability to print a wide range of production grade materials
  • Uses: functional prototypes, production-grade parts, manufacturing tools
  • Materials: all available materials (PC, Nylon, PC/ABS/ ABS etc.)
  • Dimensions: 16 x 14 x 16 in.
  • Tolerances: +/-.005” for the first inch, then +/-0.002 per inch after that


  • Large format printer at 13 cubic feet of build volume
  • Uses: Jigs & fixtures, Master Patterns, Prototyping, End use parts
  • Materials: ABS, ASA
  • Dimensions: 39 x 24 x 24 in.
  • Tolerances: +/-.010” for the first inch, then +/-0.002 per inch after that


  • ABS
  • PC/ABS
  • ASA
  • PC
  • Ultem™
  • Nylon

Best Uses

  • Fit & function models
  • Show models
  • Master patterns
  • Jigs & fixtures
  • End-Use production parts
  • ESD Safe


  • Ease of use

  • Low cost

  • Quick turnaround

  • Real thermoplastic materials

  • Testing same as production materials

Technical Information

  • Part Size: Small to Very Large
  • Tolerance:  +/-.005” for the first inch, then +/-0.002 per inch after that
  • Build Layers: 0.005”-0.013  
  • Build Style:  filament extrusion in solid and sparse
  • Supports:  Yes
  • Lead Time:  2-3 days