How accurate are print time estimates?

This estimator gives a rough guide based on geometry and settings. Actual print time depends on slicer path optimisation, acceleration settings, retraction count and part complexity. Expect estimates within 20-30% of actual time for simple shapes.

What has the biggest impact on print time?

Layer height has the biggest single impact. Halving layer height from 0.2mm to 0.1mm roughly doubles print time. Print speed is the next biggest factor, followed by infill percentage.

Does infill affect print time much?

Yes, especially for larger parts. Going from 20% to 100% infill can increase print time by 40-60% for a typical part. For small parts, the difference is less noticeable because wall printing dominates.

Why is my actual print time longer than the estimate?

Slicer estimates account for acceleration, jerk, and travel moves more accurately. Complex geometry with many small features causes frequent retraction and direction changes that add time. Bowden tube setups have longer retraction moves.

3DPrintCalcs

Print Time Estimator — 3D Print Duration

Estimate how long a 3D print will take from part dimensions, infill, speed and layer height.

Length

Part length (X axis)

Width

Part width (Y axis)

Height

Part height (Z axis)

Infill Percentage

Internal fill density

Layer Height

Height of each printed layer

Print Speed

Print head movement speed

How We Calculate This

Time Estimation Method

Extrusion time = Total volume / (Speed x Layer height x Line width)
Travel overhead = 15% added for non-printing moves
Layer changes = ~3 seconds per layer for Z-hop and positioning

Total volume is calculated from wall perimeters, top/bottom solid layers, and infill. Filament weight uses PLA density of 1.24 g/cm3.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.