Raised vs recessed QR codes: which should you print?

How raised QR geometry behaves

In raised mode, the dark QR modules sit above a base surface. This makes the geometry easy to understand in the slicer and can be convenient for a filament color change: print the base in a light material, then print the raised modules in a dark material.

Raised features are exposed to abrasion and impact. On a keychain or tool tag, sharp module edges can wear over time. On a wall sign or tabletop display, that exposure is usually less important.

• Easy to create a flat color boundary with a layer-based filament swap.
• Simple visual inspection in the slicer.
• Exposed modules can wear or catch on frequently handled objects.

How recessed QR geometry behaves

In recessed mode, the QR modules are cut into the top surface. The surrounding face can protect the code from direct rubbing, which is useful for objects that slide against other surfaces. The trade-off is optical: cavities can appear dark because of shadow even when the material color is the same. That may help or hurt depending on lighting.

The base must remain thick enough under the engraving. ModuQR checks the remaining floor so the recess does not approach the geometry minimum. For the Standard profile, 0.60 mm feature depth is a strong starting point and the base target is 1.20 mm.

• Pattern is protected below the top face.
• Can create useful shadow contrast with one material, but the effect changes with lighting.
• Requires enough base thickness under the cavities.

Raised vs recessed: practical comparison

The table describes common behavior, not a universal winner. A deeply recessed monochrome QR may scan well under diffuse light and poorly under harsh side light. A raised two-color QR may scan beautifully but wear faster on a keychain.

Feature depth should be deliberate

A relief or engraving that is only one very thin layer deep may not reproduce consistently and can disappear after first-layer variation, top-surface ironing or elephant-foot compensation. ModuQR derives feature thresholds from the selected layer height.

With the Standard 0.20 mm layer profile, the strong feature target is 0.60 mm, equivalent to roughly three layers of effective depth. The warning threshold is 0.40 mm. Use those as starting points, then inspect your slicer preview.

How to choose for your object

For business signs and WiFi plaques, raised two-color geometry is often the most predictable starting workflow. For tags, plates and durable markers, recessed geometry can be attractive if you validate the actual lighting and surface finish.

1. Use raised geometry first if you want a simple two-color sign.
2. Use recessed geometry when protecting the pattern from rubbing is more important.
3. For either mode, keep a strong light/dark optical separation whenever possible.
4. Confirm module size before spending time on geometry styling.
5. Print a small test coupon if the final object will use unusual material, gloss or lighting.