MJF vs urethane casting — two paths to low-volume production.
Urethane casting has been the go-to for low-volume production (10–500 parts) for decades. A silicone mold is cast from a master pattern, then polyurethane resin is poured into the mold to produce parts. MJF 3D printing arrived later and now competes directly in the same volume range — without the mold step. If you are evaluating how to get a few hundred production parts quickly, here is how the two processes compare.
Detailed comparison
Property-by-property breakdown
| Factor | MJF 3D Printing | Urethane Casting |
|---|---|---|
| First part lead time | 5 business days | 2–3 weeks (master + mold + pour) |
| Tooling cost | $0 | $500–$3,000 (silicone master mold) |
| Part consistency | Batch-stable | Degrades after 20–30 pulls (mold wear) |
| Material catalog | Nylon PA12, PA11, PA12 GF | Wide shore-range urethanes (30A–80D) |
| Geometric freedom | Unlimited (undercuts, internal channels) | Limited by mold pull direction |
| Best volume range | 1–2,000 identical parts | 50–500 identical parts |
| Cost at 100 parts | $$ | $$$ (mold dominates at this volume) |
| Typical surface finish | Matte, slightly grainy | As-cast smooth |
Our recommendation
Choose MJF when you need parts in a week, when material consistency matters, when the design is still evolving, or when geometry has undercuts or internal channels. Choose urethane casting when you need rubber-like elastomers not available in MJF, when the part has to match a specific shore hardness spec, or when the volume is in the 100–500 range and the design is frozen.
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MJF vs injection molding — when does 3D printing make more sense?
Choose MJF when volume is under 2,000-5,000 parts, when you need parts in days instead of months, when geometry is complex (undercuts, internal channels), or when your design is still evolving. Choose injection molding when volume exceeds 5,000+ parts of the same geometry and your design is frozen.
Injection molding vs 3D printing — which one is right for your volume?
Choose 3D printing when volume is under 2,000–5,000 parts, lead time matters, design is still evolving, or geometry is too complex for mold tooling. Choose injection molding when volume exceeds 5,000+ of the same frozen design and tooling can be amortized over the run.
SLS vs MJF — two powder-bed nylon processes, different trade-offs.
Choose MJF for faster batch throughput, smoother as-built surface, and more consistent mechanical properties across a build. Choose SLS when you need specific specialty powders (glass-filled with certain fill percentages, TPU powders, or carbon-filled variants) that are not available in MJF yet.
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