Manufacturing
8 November 2026
A buyer sends a design and asks for a price. The supplier quotes one number, and the conversation ends there. That single number usually hides a decision that affects minimum order, lead time, durability and how many colours the design can even contain. It is worth making that decision deliberately.
| Method | How the image gets there | Typical use |
|---|---|---|
| Pad print | A silicone pad picks ink from an etched plate and transfers it to the part. | One or two colour logos and small text marks. |
| Heat transfer | Artwork is printed onto a carrier film and pressed onto the part with heat and pressure. | Full-face or wrap-around graphics across the curved rim. |
| IMD / IML | The graphic is printed on a film which is placed in the mould and encapsulated in plastic during injection. | Long-run standard designs where the print must never wear off. |
| UV digital print | An inkjet head lays UV ink directly on the part and cures it with a lamp. | Photo imagery, gradients, short runs, multiple SKUs at once. |
Read across the row for the constraint that matters most to your programme. In practice one column usually ends the discussion immediately.
| Dimension | Pad print | Heat transfer | IMD | UV print |
|---|---|---|---|---|
| Plate or film tooling | Low, per colour | Medium, per design | High, film forming plus injection | None |
| Realistic minimum | 500+ | 1,000+ | 3,000+ | 50 to 100 |
| Colours in the artwork | 1 to 3 | Up to 6 | Up to 6, plus metallics | Effectively unlimited |
| Abrasion resistance | Weakest | Good | Excellent, print is under the surface | Moderate, needs a clear coat |
| Wrapping the curved rim | Poor | Good | Only if designed in | Good on flat areas, weaker over sharp radii |
| Cost per piece at 1,000 | Lowest | Low | Low, once tooling is amortised | Highest |
| Change one colour in the design | New plate | New film | New film and often new mould insert | Edit the file |
IMD produces the best durability of the four, because the image sits beneath a layer of plastic and cannot be scratched off. That makes it the right answer for a product that must survive two years of pocket wear.
What gets glossed over is the tooling. IMD is not a printing process bolted onto an existing mould; it needs a film-forming tool as well as the injection tool, and the part geometry has to be designed for it from the start. Trying to add IMD to a case that was designed as a plain mould usually means starting the tooling again. If a supplier proposes IMD on a small first order without mentioning a film tool, the question has not been asked properly.
UV print has no tooling and no colour count, which makes it the only economic route when the design changes often or the order is small. A hundred pieces across four different artworks is entirely normal; with pad print that would mean four sets of plates.
Its weak point is adhesion at the edges. Ink sits on the surface, so the corners take the wear first. Two things mitigate it: a primer layer before printing, and a clear top coat afterwards. Ask specifically whether both are included, because a quote that omits the top coat will look cheaper and fail sooner. White ink is also a cost item in its own right, since it is laid down as an opaque base under any light colour. Adhesion failures have their own names on an inspection report; the defect glossary covers the tape test and the limits that go with it.
Whatever the method, the artwork on paper and the artwork on a curved plastic part will not match exactly. Four things move the colour: the substrate colour underneath, the white base layer, the surface finish, and the viewing angle on a curved face.
The practical answer is to approve a physical strike-off rather than a screen proof. Under office lighting a matte black case makes printed colours look duller than the file suggests; the same print on a gloss white case looks lighter and colder. If the design depends on a specific brand colour, ask for a Pantone reference and accept that the nearest achievable match is a tolerance, not an exact hit. On UV print, expect a slightly larger tolerance than on heat transfer, because the ink is not pressed into the surface. The measurement method is the same one described in colour approval for moulded parts, and it applies equally to printed areas.
One more consideration that rarely appears in a quote: if the same design will run for several seasons, the tooling-heavy routes get cheaper every year, while the tooling-free route never does. The right answer therefore depends on how long you intend to sell the design, not only on the first order quantity.
Two decorated designs that make the difference between print and inlay obvious: Prism Two-Tone Iridescent Magnetic for iPhone 18 Pro Max and Prism Two-Tone Iridescent Clear Orbit Stand for iPhone 18 Pro Max.
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