How is the print time estimated?

Extrusion time equals total path length divided by print speed. Path per layer is the perimeter path scaled up by infill, multiplied by the number of layers (height divided by layer height). A travel overhead percentage and a 0.4 second-per-layer change time are then added.

Why is this only a rough estimate?

A slicer computes the exact toolpath from your model mesh, including every travel move, acceleration ramp, and retraction. This tool works from a single per-layer path length, so expect plus or minus 15-30 percent depending on geometry complexity.

How do I find the per-layer path length?

Approximate it as the perimeter of a typical cross-section times your wall count. For a 50mm-wide part with 3 walls, that is roughly 50 times 4 sides times 3 walls, about 600mm. The infill field then scales the interior automatically.

Does layer height change the time a lot?

Yes, strongly. Halving the layer height doubles the number of layers and roughly doubles print time, because each layer must be traced separately. Going from 0.2mm to 0.1mm is the single biggest time multiplier on most prints.

Why add a travel overhead?

Real prints spend time on non-extruding moves: hops between islands, travel across gaps, and infill-to-perimeter transitions. A 15-25 percent overhead approximates this. Sparse, scattered geometry needs a higher value than a single solid tower.

What is the 3D Print Time Estimator?

Estimate 3D print time without a slicer. Enter object height, layer height, per-layer path length, print speed and infill to get total layer count and an approximate print duration with travel and layer-change overhead. It runs free in your browser on Gera Tools, with nothing uploaded.

3D Print Time Estimator

Name: 3D Print Time Estimator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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A quick way to gauge how long a print will take when you do not have a slicer preview handy — useful for planning a print queue or deciding whether a job will finish overnight.

How it works

The estimate is built from layer count and extrusion path length.

Step 1 — Layer count. Divide the object height by the layer height and round up:

layers = ⌈height ÷ layer height⌉

A 60mm object at 0.2mm layers is ⌈60 ÷ 0.2⌉ = 300 layers.

Step 2 — Path per layer. The perimeter path you enter is the outline at 0% infill. Infill adds interior travel proportional to its density:

path per layer = perimeter path × (1 + infill ÷ 100)

Step 3 — Extrusion time. Total path divided by print speed:

extrusion time = (path per layer × layers) ÷ print speed

Step 4 — Overhead. A travel-overhead percentage covers non-printing moves, and each layer change adds 0.4 s for Z-hop and carriage settle. A one-off first-layer allowance is added too (first layers usually print slowly for adhesion):

total = extrusion time × (1 + overhead ÷ 100) + layers × 0.4 s + first-layer extra

Example

A 60mm tower, 0.2mm layers, 400mm perimeter path per layer, 60 mm/s, 20% infill, 20% overhead:

layers = 300
path per layer = 400 × 1.20 = 480 mm
total path = 480 × 300 = 144 000 mm = 144 m
extrusion time = 144 000 ÷ 60 = 2400 s
with overhead and layer changes ≈ 2400 × 1.20 + 300 × 0.4 ≈ 3000 s ≈ 50 m

Notes

Treat the output as a planning figure, not a guarantee — accuracy is typically ±15-30%. For an exact number, slice the model: the slicer traces the real toolpath and accounts for acceleration, retraction, and per-feature speed overrides this tool cannot see.