Conformal cooling is additive manufacturing's most reliable business case

A cooling channel that follows the mould surface shortens cycle time on every part made for the tool's life. The payback is arithmetic, not a projection.

By LasersNews Desk·15 Jul 2026·2 min read

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Injection mould cooling channels are conventionally drilled, which means straight lines. A curved mould surface therefore has channels at varying distances from it, and cooling is uneven: the part cools slowly where channels are far away, and cycle time is set by the slowest region.

Additive manufacturing builds channels that follow the surface at constant distance.

Why the case is unusually solid

Injection moulding cycle time is dominated by cooling. Reducing cooling time reduces cycle time roughly proportionally, and cycle time multiplies across every part the tool produces — often hundreds of thousands.

A twenty per cent cycle reduction on a tool running three shifts is a large and continuous saving, and it is calculable in advance from thermal simulation rather than estimated.

Uniform cooling also reduces warpage and internal stress in the moulded part, which improves quality and can widen the process window.

What it costs

The tool insert costs more to produce additively than to machine, and the material choice is constrained to what can be built and is suitable for tooling — maraging steel and similar.

Surface finish requires machining and polishing after building, since a mould surface must be better than as-built.

And the internal channels cannot be inspected easily or cleaned mechanically, which raises a maintenance question that conventional drilled channels do not.

Where it applies

Tools with cycle times long enough that cooling dominates, produced in volumes high enough to amortise the insert cost, with geometry where conventional cooling is genuinely poor.

Thick sections, deep cores and complex surfaces fit. Simple flat tools with adequate conventional cooling do not.

Why it matters beyond moulding

The conformal cooling case is worth understanding because it is the cleanest demonstration of what additive genuinely offers: geometry that improves function and that no other process can produce, in an application where the benefit is measurable and recurring.

Many additive business cases rest on part consolidation or mass reduction, where the benefit is real but harder to quantify. This one is a cycle time number multiplied by a production volume, which is why it has been adopted steadily without needing advocacy.

This article was produced by the LasersNews AI desk and reviewed by our editors.