FDM vs MJF — cost-effective prototyping vs production-grade nylon.
FDM is the most affordable 3D printing technology — ideal for prototypes, concept models, and functional parts where surface finish is secondary. MJF (HP Multi Jet Fusion) produces parts in production-grade Nylon PA12 and PA11 with consistent mechanical properties across batch runs. The choice comes down to whether you need low-cost iteration speed (FDM) or production-grade consistency and strength (MJF).
Specifications
Head-to-head comparison
| Spec | FDM | MJF |
|---|---|---|
| Tolerances | ±0.5mm | ±0.3mm |
| Layer height | 0.1-0.3mm | 0.08mm |
| Min wall thickness | 1.2mm | 0.7mm |
| Max build size | 360 x 360 x 360mm | 380 x 284 x 380mm |
| Lead time | From 1 business day | From 5 business days |
| Materials | PLA, PETG, TPU, ASA, PC CF | Nylon PA12, Nylon PA11, Nylon PA12 Glass Filled |
| Best for | Jigs & fixtures, Functional prototypes, Concept models, Large-format parts, Cost-sensitive runs | End-use production parts, Production runs, Complex geometries, Automotive components, Aerospace hardware |
Our recommendation
Choose FDM for early prototyping, concept models, and large parts where cost matters more than surface finish. Choose MJF when you need production-grade mechanical properties, batch consistency, and parts that can ship to end customers.
FAQ
Frequently asked questions
Is MJF stronger than FDM?
Yes. MJF Nylon PA12 produces isotropic parts with consistent strength in all directions (48 MPa tensile). FDM parts are anisotropic — weaker along the Z-axis due to layer adhesion. For production parts under load, MJF is the stronger choice.
Is FDM or MJF cheaper for prototypes?
FDM is cheaper for prototyping, especially at low quantities (1–10 parts). FDM uses lower-cost thermoplastic filament and has the fastest turnaround from 1 business day. MJF becomes cost-competitive at higher quantities (50+ parts) due to batch efficiency.
Does MJF require support structures?
No. MJF parts are self-supporting in a bed of nylon powder. Internal channels, undercuts, and complex geometries print without supports. FDM requires support structures for overhangs beyond 50 degrees, which leave witness marks.
What is the build volume difference between FDM and MJF?
FDM builds up to 360×360×360mm at Makelab, while MJF builds up to 380×284×380mm. The volumes are comparable, but FDM can print taller parts in one piece.
When should I switch from FDM prototyping to MJF production?
Switch to MJF when your design is validated and you need 50+ consistent parts. MJF delivers batch-to-batch dimensional consistency and production-grade nylon strength that FDM cannot match at volume.
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