Layer Height

Definition

Layer Height is the thickness of each layer of plastic extruded in FDM 3D printing, typically ranging from 0.04 mm to 0.32 mm (with a 0.4 mm nozzle as reference). It is the most critical parameter affecting print quality, surface finish, and print time.

Simple Analogy

Think of a printed object as a stack of paper. The thinner each sheet, the smoother the side of the stack — but it also requires more sheets (more layers) and more stacking time. Layer height is the “thickness of each sheet” — thinner means finer detail, but takes longer.

Why It Matters

Layer height directly determines the visibility of layer lines and total print time:

• Low layer height (0.08-0.12 mm): Smooth surface with barely visible layer lines, ideal for figurines and display models. Downside: print time doubles.
• Medium layer height (0.16-0.20 mm): The best balance of speed and quality, the default choice for most everyday prints.
• High layer height (0.24-0.32 mm): Fast print speed, but visible layer lines. Best for functional prototypes, rough parts, or test prints.

Practical Advice

Don’t always reach for the highest precision. Many beginners default to 0.08 mm layer height and end up spending an entire day on a simple part — yet 0.20 mm layer lines are invisible from 30 cm away. For the vast majority of everyday prints, 0.20 mm is the most efficient choice. Only drop below 0.12 mm when you truly need a fine surface finish (like a gift for a friend).