Tooling is the one genuinely large upfront cost in a custom glass project, and it is also the one where the terms are most often left vague. Tooling charges vary enormously between suppliers for what appears to be the same job. Understanding the components and the ownership question prevents expensive arguments later.
What determines tooling cost
Shape complexity
The dominant factor. A straight-sided jar with a standard neck finish is straightforward. Every additional feature adds cost:
| Design feature | Effect on tooling |
|---|---|
| Straight or simple taper | Baseline |
| Draft angle requirements | Modest increase; poor draft means the piece sticks and wears the mould |
| Shoulder transition | Moderate increase |
| Multi-part mould, undercuts | Significant increase, more mould sections |
| Embossing, faceting, ribbing | Significant increase, detailed cavity machining |
| New neck finish or thread | Significant increase; thread profiles may need separate verification |
| Unusual proportions or very wide or very tall | Moderate increase, more material and slower cycles |
Mould size and material
Larger jars need larger mould sections and more steel. Mould steel quality affects how long the mould lasts and how consistent the output stays, and lower-cost steel usually means faster wear and more dimensional drift over the mould\’s life.
Number of cavities
Producing two or four pieces per cycle doubles or quadruples output per machine cycle, but requires a proportionally larger machine and a proportionally larger tooling investment. For high-volume products this is worth it; for shorter runs it is not.
Whether the mould already exists
The largest potential saving. If a similar mould already exists and only minor modifications are needed, the cost and lead time can be a fraction of a new build. Always ask what existing moulds are close to your design. Modifying a near-match is frequently the most economical route, and it also compresses the schedule considerably.
Tooling lead time
Typical ranges, which should be in writing:
- Modification of an existing mould: 2–4 weeks
- New single-cavity mould, simple shape: 4–6 weeks
- New multi-part mould, complex shape: 6–10 weeks
Add trial production and first-off approval on top. Tooling lead time is frequently the single largest schedule risk in a custom launch, because it sits at the very start with no ability to compress later.
Ownership: the point most often skipped
Standard practice, and the basis for most disputes, is as follows.
Who owns the mould. Normally the customer who paid for it, with the physical mould held at the factory. Some suppliers retain ownership and treat tooling as part of their equipment, refundable only under specific conditions. This must be stated explicitly, because it determines what happens if you later move production elsewhere.
Lifetime production rights. This is the more important question. Paying for a mould does not always mean you can order the same product from another factory. If the design is not registered or protected, another factory can produce the same shape. Ask whether they will register the design or provide design confidentiality, and get that in writing.
Maintenance and storage. Who pays for mould maintenance, and who is responsible for storage when the mould is idle? Moulds left unused for years degrade. Agreement on periodic maintenance avoids a large unexpected repair cost when you restart production.
Transfer on exit. If you end the relationship, do you get the physical mould? This must be agreed in advance, together with the condition it will be returned in and who pays for removal. Without this, a supplier has no obligation to release it.
Points to put in writing before payment
1. Tooling cost, stated separately from unit price
2. Tooling lead time, with milestone dates
3. Number of cavities and expected output per cycle
4. Mould ownership and where it will be held
5. Design confidentiality and whether the design will be registered
6. Whether another supplier may produce the same design
7. Maintenance responsibility and who pays
8. Conditions for releasing the mould if the relationship ends
9. Which party owns the tooling if it is paid for but never used
10. Refund terms if the first trial production does not meet the approved sample
Point 10 matters more than it appears. Tooling is non-refundable in most cases once work begins, and a mould that produces a product you cannot sell is a sunk cost unless there is an agreement.
Amortising the cost
Tooling should be spread across a realistic order volume. Calculate the per-unit amortised cost before deciding whether a custom shape works commercially:
Total project cost = tooling cost + first order cost. Divide by expected units over two to three years and add that figure to the unit cost before setting your price.
If the amortised figure makes the product uncompetitive, either increase the volume, raise the retail price, or choose a standard mould with no tooling cost. That calculation is the moment to decide, and it is far better than discovering after paying for tooling that the economics do not work.
Send us your design and your target volume, and we will tell you the tooling cost, the lead time and whether the economics work at that volume. Request tooling quotation.