Phone cases look like an easy product and behave like a precise one. The printable area is small, the shape is curved, the camera opening is unforgiving, and a new handset model arrives every year with a different outline. On cases, the setup is the product, and the printing is the easy part.

This guide covers what governs a custom phone case job on a compact UV flatbed: why a case needs its own qualification, how to record the case and the model, what camera cut-outs and rims change, how clear and dark cases are handled, when a fixture or the vision route is appropriate, how to control many models, and what to test before an order ships.

Why does a phone case need its own qualification?

Because a generic case file does not fit a real model.

Cases differ in outline, camera module, corners, rims and flexibility, so the published guidance is to test the named production case rather than to scale one file across models.

The published phone-case workflow states the point directly: do not infer compatibility from the overall case dimensions alone, because flexible walls, raised edges, camera rims, coatings, contamination, fixture height, print-side choice and inspection requirements can all change the result. A case that fits the bed easily can still fail on the geometry of its own face.

The consequence for a shop is that the case becomes a specification rather than a category. Each model is a separate qualification, and the published route freezes the case SKU before sample work begins, recording the supplier, model, lot, material description, coating, colour, dimensions and flexibility. That record is what allows a repeat order for the same model to reproduce the first one.

How should the case and its model be recorded?

By model, supplier, batch, material and coating.

The published route freezes the case SKU first, recording supplier, model, lot, material description, coating, colour, dimensions and flexibility before sample work begins.

That list exists because a case is not one material. A clear polycarbonate shell, a soft thermoplastic polyurethane case and a coated hard case each present a different surface and a different flexibility, and the flexibility matters twice: it affects how the case sits in a fixture, and it affects whether the printed ink can move with the part without cracking. Recording the material and the coating is what makes the difference visible on the record rather than in the reprint.

The published list also asks for the lot, and that field matters more than it appears. Two shipments of the same case model can differ in coating or wall thickness, and a change of lot is the most common reason a repeat job behaves differently. Recording the lot turns an unexplained change into an identified one.

What do camera cut-outs and rims change?

They are no-print and clearance zones.

Camera openings, buttons, edges and raised rims should be measured and mapped for every model, because the published guidance warns against scaling one generic file across models.

The published phone-case workflow asks for the printable area to be defined from the real case rather than from a generic phone outline, with camera, button, edge and raised-rim zones marked as no-print areas. The reason is that these features are not only holes; they are references. A raised rim changes the head clearance, a camera module creates a zone the artwork cannot cross, and an edge that is left bare is often a design choice rather than a defect.

The published artwork guidance for this range makes the same demand in general terms, asking for cutouts, display openings, fasteners, vents, bends and raised rims to be mapped as controlled no-print zones taken from the current drawing. On a phone case the drawing changes with every handset generation, which is why the file has to carry the zones rather than the operator reconstructing them at the machine.

How do clear cases change the print construction?

They change where the white layer sits.

For a clear case the published guidance is to define whether the design is viewed from the printed side or through the case, then compare the three constructions on the real case.

The viewing direction decides the stack. A design that is viewed from the printed side works like a normal print, with the image on top. A design that is viewed through the case is printed on the reverse, which reverses the layer order and makes the white layer the background rather than an underbase. The published workflow for transparent work is the same in principle, and the phone-case guidance asks for the three constructions to be compared under the intended viewing condition before approval.

Selective white is the middle option, and it is usually where the interesting work happens. A design that is mostly transparent with an opaque element needs white only where the opacity is wanted, and that is a design decision rather than a printing one. Comparing the three builds on the real case is the fastest way to settle it, because the same artwork can look very different through a clear shell.

How should dark and textured cases be handled?

Test the real surface and case colour.

On an opaque or dark case the published approach is to test the actual surface and colour to determine preparation, white-underbase coverage, colour appearance, varnish use and handling resistance.

A dark case is not a single condition. A matte black soft-touch coating, a glossy dark shell and a textured dark case each hold ink differently, and the white layer that makes the colour read on one may look thin on another. The published workflow therefore asks for the real surface and the real case colour to be tested rather than assumed, with the white coverage and the varnish use decided on that test.

Contamination belongs in the same check. Mould release, polish, finger oils and dust from the case manufacturing process can all sit on the surface and interfere with adhesion, and the published guidance for this range is to control the surface and to remove contamination before printing. A cleaning method that is standardised and recorded is the cheapest adhesion improvement available.

Should a fixture or the vision route position the case?

By the case rigidity, outline and variation.

The published position is to review the real fixture and the current optional vision route against case rigidity, outline, artwork variation, tray repeatability and the inspection standard.

The compact platform in this range is published with an optional wide-beam scanning camera and a positioning tolerance of 0.01 millimetres with dual Y-axis motors, and the published phone-case workflow treats the two routes as a genuine choice. A rigid case with a stable outline and a high tray count usually suits a fixture, because the pocket repeats the position and the loading is quick. A run with many models, or a case whose outline varies, is where the vision route earns its place.

What the published guidance rules out is the improvised middle. If the vision route is part of the reviewed setup, it should be part of the record; if it is not, the fixture should be the whole answer. A process that is half fixture and half vision has neither the repeatability of a pocket nor the flexibility of a scan.

How do you control many models and designs?

With a position-to-file matrix per model.

Each case model and loaded position should be connected to the correct artwork, order identifier, white layer, varnish layer and inspection reference, so a model change is a file change.

The published phone-case workflow asks for every model and loaded position to be connected to the correct artwork and order identifier, and for the white, varnish and inspection references to travel with it. That is the same discipline used for medals and other small parts, applied at the scale of the tray. Where a shop runs many handset models, the tray rather than the machine becomes the unit of control.

The published personalised-work guidance adds that the current file source, part mapping, verification and traceability process should be reviewed before production. On a phone case the printed identity may include a name, a logo or an order reference, and the link between that printed element and the order it belongs to has to be recorded rather than reconstructed after a complaint.

What should be tested before a case order ships?

Placement, colour, opacity, varnish and handling.

The published test list confirms placement, colour, opacity, varnish location, surface appearance and the adhesion, scratch and handling checks the finished case must survive.

The flexibility check is the one that is specific to cases. A case is handled, fitted and removed, so the ink has to move with a surface that bends, and the published guidance for this range asks for the handling requirement to be established before a process is approved. Adhesion is assessed with the tape method under ASTM D3359 and wear under ASTM D4060, and a case that passes both on a flat sample should still be checked on a flexed one. The chemical and material obligations for the inks and substrate follow the applicable regulations (REACH), and occupational guidance for the workshop is published by the relevant authority (HSE printing). Process practice for industrial print is published by the industry bodies in the field (PRINTING United Alliance), and product safety certification is handled by recognised bodies (UL).

What the decision comes down to

A custom phone case job is decided by its geometry and its layer stack, not by the machine speed. Record the model and its material, map the camera and rim zones, choose the white construction for the viewing direction, settle the positioning route, and test on the real case.

The published case workflow for this range sits with the custom phone case collection and the AJ1206 page, the positioning routes are covered in the guide to small-part vision positioning, and the file and zone requirements are set out in the article on preparing artwork files.