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.
FAQ
Frequently asked questions
Is MJF faster than urethane casting?
Yes. MJF delivers first parts in 5 business days with zero tooling. Urethane casting requires 2–3 weeks for master pattern fabrication, silicone mold creation, and resin pouring before the first part ships.
When is urethane casting better than MJF?
Urethane casting is better when you need rubber-like elastomers in a specific shore hardness (30A–80D) not available in MJF, or when you need cast-smooth surfaces. MJF is limited to nylon (PA12, PA11, PA12 GF).
Do urethane molds wear out?
Yes. Silicone molds typically degrade after 20–30 pulls. Each replacement mold costs $500–$3,000. MJF has no mold — part consistency remains stable across any quantity from 1 to 2,000+.
What volume range is best for MJF vs urethane casting?
MJF is competitive from 1 to 2,000 identical parts. Urethane casting is typically best at 50–500 parts when the design is frozen. Above 500, urethane mold wear drives costs up and MJF wins clearly.
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