Many products sit in an awkward middle: too many units for 3D printing or machining to be economical, too few — or too uncertain — to justify hardened production molds. Low-volume tooling fills that gap.
Options between printing and production tooling
| Approach | How it works | Good for |
|---|---|---|
| Vacuum casting | Silicone mold from a master pattern; polyurethane resins | Tens of parts that look molded |
| Aluminum mold | Cavity machined in aluminum; fast to make and modify | Hundreds to low thousands of parts |
| Bridge tool | Simplified steel tool used until production tooling is ready | Market launch while demand is uncertain |
| Family mold | Several different parts in one mold | Kits and assemblies with low volume per part |
| MUD / insert molds | Interchangeable inserts in a standard mold base | Small parts; lower tooling cost |
Trade-offs to understand
- Mold life is shorter, especially with glass-filled resins
- Manual operations may replace slides, so cycle time and part cost are higher
- Cosmetics may differ from final production tooling (texture, gate marks)
- Family molds can be hard to balance — every shot makes all parts, even if you need only one
- Tolerances and material properties are production-grade, unlike printed or cast parts
A practical path for new products
- Prototype with 3D printing or machining until the design is stable.
- Do a DFM review as if the part were going into production tooling.
- Build an aluminum or bridge tool for the first few hundred or thousand units.
- Collect field feedback; make design changes on the cheaper tool.
- Invest in production tooling when volume is proven.
This path is part of our small batch manufacturing approach. For cost drivers of full production molds, read injection mold cost explained.