Print Time Estimator

Print time estimation helps you schedule prints, quote jobs, and decide whether to optimize settings or just let it run.

Basic print time formula: Print Time ≈ Total Filament Length (mm) ÷ Average Effective Speed (mm/s)

Slicers account for acceleration, travel moves, and layer changes automatically. Manual estimation uses a simplified model:

Simplified formula: Print Time (hours) = (Part Volume in mm³ × Infill Density × 1.2) ÷ (Flow Rate in mm³/s × 3600)

The 1.2 factor accounts for shells, travel overhead, and layer change time. The calculator below uses a different, layer-based estimate: layers (height ÷ layer height) × time per layer (perimeter ÷ print speed). Both are rough planning figures; your slicer’s preview is the accurate one.

Worked example: Part volume: 40 cm³ | Infill: 20% | Flow rate: 5 mm³/s Print Time = (40 × 1000 × 0.20 × 1.2) ÷ (5 × 3600) = 9,600 ÷ 18,000 = 0.53 hours ≈ 32 minutes

(Note: 1 cm³ = 1,000 mm³ for unit conversion)

Factors that extend print time significantly:

• Support material: adds 20–80% more time depending on geometry
• Brim or raft: adds 5–20 minutes for large footprints
• Many small parts at once: travel overhead accumulates
• Low layer height (e.g., 0.1 mm vs. 0.2 mm): roughly doubles time

Speed vs. quality trade-offs:

Practical tip: trust your slicer’s estimate over any manual formula. The slicer has the exact G-code and knows every travel move; this page knows four numbers. Where a manual estimate earns its keep is before you commit to a model, when the question is “roughly overnight or roughly a week” rather than “will it finish by four”.

Why the answer here comes out low

The layer-based model below counts perimeter extrusion and nothing else. It does not count infill, it does not count the solid top and bottom layers, and it does not count travel, retraction or the acceleration ramp at every corner. On a hollow, mostly-vertical part it lands close. On a chunky part at 40% infill it can be half the real figure, and the panel says so with a scaled-up estimate next to the raw one.