How Double Shot Molding Changes Your Per-Part Production Cost

Double shot molding can increase the cost assigned to each finished part because it requires specialized two-color tooling, multiple materials, mold validation, dimensional checks, and coordinated production planning. There is no standard surcharge that applies to every project. The actual amount depends on the mold layout, cavity count, material pairing, order volume, and whether approved samples move into full production.

What Drives the Added Cost?

Unlike a conventional single-material mold, double shot molding combines two injection operations within one tooling system. This supports hard-and-soft combinations such as ABS with TPU or PP with TPE, while also requiring accurate registration between the two shots. High-precision alignment, the selected cavity arrangement, and the complexity of the part can all affect the tooling budget and the cost allocated to each component.

Tooling Investment and Production Volume

The listed mold construction uses 718H / 1.2738 steel and is designed for a service life of up to 800,000 shots. When the mold is used for a substantial production run, its initial investment can be spread over a larger number of parts. For a smaller order, the tooling portion of the unit cost is generally more significant. The available information does not include a mold price, cycle time, scrap percentage, material rates, or a fixed per-part premium.

Material Selection and Process Validation

Material costs vary according to the selected hard-and-soft combination. ABS+TPU and PP+TPE are identified as compatible options, but each pairing may require different processing conditions and validation work. Mold trials, dimensional testing, and pre-shipment inspection are part of the stated quality activities and should be considered when comparing the complete manufacturing cost with other molding methods.

The manufacturing process is structured around sample approval before mass production, with production quantities negotiated for each project. This approval stage can add development and inspection expense, but it also helps confirm alignment, appearance, fit, and part dimensions before volume manufacturing begins.

Cost Factors at a Glance

Project Information Needed for a Quote

To estimate the additional per-part cost accurately, a supplier needs the part geometry, selected material combination, mold structure, planned cavity count, expected production volume, inspection standard, and sample-approval requirements. It is also important to confirm whether the quotation covers only mold development or includes plastic injection mass production.

Frequently Asked Questions

Is double shot molding always more expensive per part?

The supplied information does not provide a direct price comparison. Because the process uses two-color tooling, two compatible materials, precise alignment, and additional validation, the unit cost must be calculated for the specific product and production plan.

What information determines the extra cost?

The main inputs are the hard-and-soft material pairing, mold design, cavity configuration, estimated quantity, inspection scope, and whether approved samples will be followed by mass production.

Does a larger order reduce the tooling amount assigned to each part?

Generally, yes. A higher production volume can distribute the mold investment across more units. The listed service life is up to 800,000 shots, but no fixed amortization formula or unit surcharge is provided.

Conclusion

The added per-part expense of double shot molding is primarily connected to the two-color mold, material selection, alignment and cavity requirements, trial and inspection work, and the quantity used to recover the tooling investment. For a reliable estimate, request a project-specific quotation based on the product design, materials, cavity plan, target volume, and sample-approval process. Longterm provides custom mold manufacturing, injection molding, and mold development with plastic injection mass production. For technical assistance or a detailed quotation, contact rogerluo@longterm-mold.com.

About Longterm Mold

Longterm Manufacturing Solutions Limited, operating as Longterm Mold, was established in 2010 and serves international customers with mold design, tooling, precision machining, mold manufacturing, and plastic parts production. The company has 50 employees and operates from a 2,000sqm factory. Its R&D engineers support injection mold structural design, precision CNC component development, sample verification, and process improvement. Longterm holds ISO 9001:2015 certification covering the design, manufacturing, and sales of precision molds, as well as the sales of plastic products, and has experience serving customers in several industries.