Layer Height

Layer height is the vertical step per layer. Smaller layer heights (thinner layers) give smoother slopes and better Z-detail but increase print time and can make small tuning issues more visible; larger layer heights print faster and hide fewer mistakes, but show stronger layer lines and can lose fine Z features. A practical range is typically about 25–75% of your nozzle diameter (for a 0.4 mm nozzle, roughly 0.12–0.28 mm).

TL;DR

For a 0.4 mm nozzle, start at 0.20 mm for most prints, use 0.12–0.16 mm for smoother curves and text, and 0.24–0.28 mm for faster drafts. If small embossed details disappear or slopes look “stair-stepped,” lower layer height; if prints take forever, raise it.

Layer height vs nozzle size and tradeoffsTopic-specific diagram for the concept, checks, and tradeoffs in this lesson.0.12 mmfine detail, slow0.20 mmbalanced default0.28 mmdraft, fasterZ detailimproves as layers shrinkPrint timerises as layers shrink0.4 nozzlecommon baseline
Connects nozzle diameter to a practical layer-height range and shows the quality/time tradeoff.

What layer height actually controls

Layer height is the Z distance the printer moves up after each layer. A smaller layer height means more, thinner layers; this reduces the stair-step look on angled surfaces and captures shallow curves, chamfers, and small vertical features (like embossed text). A larger layer height means fewer, thicker layers; it prints faster, but layer lines are more visible and small Z details can get “quantized” away.

Quick starting values (0.4 mm nozzle)

  • 0.12–0.16 mm: best for curved surfaces, small Z details, nicer top surfaces; slower
  • 0.20 mm: general-purpose default for most functional parts
  • 0.24–0.28 mm: fast drafts and large parts; more visible layer lines, less Z detail

How layer height changes print time (what to expect)

Layer height mainly changes time by changing the number of layers. Cutting layer height from 0.20 mm to 0.10 mm roughly doubles the layer count, so print time often rises a lot even if speeds don’t change. Detailed models may also add more travel moves and retractions across many more layers, which can make stringing, zits, or seams more noticeable if temperature/retraction are borderline.

Strength, accuracy, and fit: what layer height does and doesn’t do

Layer height can influence layer-to-layer bonding, but overall strength is usually dominated by part orientation, wall count, line width, infill pattern, and material choice. Thicker layers can sometimes tolerate higher flow and bond well, but they also create larger “steps” on sloped load-bearing faces. For tight fits and mating surfaces in Z (stacking parts, lids, sliding faces), smaller layer heights often improve Z resolution and reduce the amount of scraping/sanding needed.

Change layer height without chasing your tail

  1. Change only layer height first; keep temperature, speeds, and line width the same for the test.
  2. Pick a small test print with slopes plus a few Z-sensitive features (embossed text, chamfers, shallow domes).
  3. Check slicer preview: at larger layer heights, thin steps or tiny embossed features may vanish entirely.
  4. After printing, inspect: slopes (stair-stepping), small text (legibility), and top surfaces (gaps or roughness).
  5. If very small layers look under-extruded (gaps, weak layers), try a small temperature increase or a small speed reduction before changing multiple settings at once.