Published September 22, 2026 · MfgWorkbench editorial reference
In FDM printing, layer height sets the vertical increment between deposited layers. It changes stair-stepping and layer count, but does not independently control every dimension or surface feature.
Relate height to the nozzle and profile
Use a profile intended for the nozzle diameter and material. Prusa’s guidance places the maximum around 70–80% of nozzle diameter for its stated profile approach. For a 0.4 mm nozzle, 80% is 0.32 mm. Treat that as profile guidance, not permission to ignore extrusion width, flow or printer limits.
Very small layers do not automatically improve XY details, which depend on extrusion width, toolpaths and the feature itself. A vertical wall, shallow slope and top surface can respond differently to the same layer-height change.
Layer count and time example
A 40 mm-tall region uses about 200 layers at 0.20 mm and 400 at 0.10 mm, ignoring the first-layer and adaptive-height details. Twice as many layers does not guarantee exactly twice the print time: travel, acceleration, cooling limits, infill rules and extrusion speed also contribute.
Compare slicer estimates under otherwise controlled settings and inspect the surfaces that matter. Adaptive layer height may concentrate fine layers on curved regions while keeping coarser layers elsewhere, if the slicer and process support it.
Check volumetric demand
A rectangular-bead approximation gives flow Q ≈ line width × layer height × speed. At 0.45 mm width, 0.20 mm height and 60 mm/s, Q ≈ 5.4 mm³/s. Increasing height to 0.30 mm at the same width and speed raises that estimate to 8.1 mm³/s. The real bead cross-section and slicer implementation can differ.
If the hotend/material combination cannot sustain the required flow, simply increasing layer height may reduce quality rather than shorten a successful job. Use the linked flow tool and printer profile limits, then test.
Choose by the accepted part
Evaluate surface appearance, fit, strength requirements and cost together. Keep orientation and material constant during a comparison. Layer height is a process choice, not a substitute for dimensional measurement or mechanical testing.
References and verification
Original explanations and worked examples by MfgWorkbench. Sources below support the stated concepts or selected reference data; they do not certify every example or a production application.
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