Label Legend Design: Typography for Arm's Length and Bad Light

A label legend is typography under the worst conditions in the building: half-inch canvases, 203-dot rendering, readers in gloves holding flashlights. Office design instincts — elegant faces, tight tracking, subtle grays — all fail here. What works is a short list of blunt rules about dots, contrast, margins, and hierarchy, applied without exception.

Figure 1: The working standard — bold sans-serif, maximum contrast, one idea per line.Legibility beats elegance, always

1. Text Size Floors by Printhead Resolution

Two floors per resolution: what the head can render, and what a human can use. Design to the second one.

Distance rule of thumb for signs and rack labels: roughly 1 inch of letter height per 25 feet of viewing distance in good light — degrade generously for dim aisles and dirty lenses. The same logic drives ASME A13.1's letter-height-by-pipe-OD tables.

2. The Blunt Rules

• Sturdy sans-serif, regular-to-bold weight, default tracking. Condensed and light faces render gappy at thermal resolutions — the dots cannot split.
• Dark-on-light by default; reverse print only for header bars and status blocks. Never reverse a barcode.
• Keep 1–2 mm of clear margin inside the die-cut edge. Web tracking drifts slightly; content at the edge gets clipped on some fraction of every roll.
• One idea per line, biggest fact first: the wire number above the circuit description, the asset ID above the department. The two-second flashlight test is the acceptance criterion.
• ALL CAPS only for short identifiers (wire numbers, port IDs) — mixed case reads faster for anything sentence-like, which is why Z535 message panels are not shouted.
• On self-laminating wire wraps, keep the whole legend inside the printable zone height — anything below the line disappears under the clear wrap, per the AWG sizing chart geometry.