What is minimum layer time?

The shortest time a layer should take before the next layer starts. If a layer prints too fast, the previous layer has not cooled enough and will deform. Most slicers default to 8-15 seconds.

When should I use 100% fan?

PLA prints benefit from 100% fan for overhangs and bridges. For PETG reduce to 30-50%. For ABS and ASA, use minimal or no fan to prevent warping.

Why do small prints curl?

Small layers complete very quickly, giving no time for the plastic to cool and solidify before the next layer is deposited. Enable minimum layer time in your slicer to automatically slow down.

3DPrintCalcs

Cooling Calculator — Layer Time & Fan Speed

Estimate minimum layer time and fan speed for proper cooling of small parts and overhangs.

Perimeter Length

Total path length per layer

Print Speed

Layer Height

How We Calculate This

Calculation

Layer time = Perimeter length / Print speed
If layer time is below minimum (10s), the slicer should slow down or lift the nozzle.
Fan speed recommendation depends on layer time and material.

Frequently Asked Questions

Related Calculators

Layer Height Calculator

Find optimal layer heights based on your nozzle size and desired quality.

Print Speed Calculator

Calculate maximum print speed based on volumetric flow rate and layer dimensions.

Infill Calculator

Estimate material usage and print time for different infill percentages and patterns.

Wall Thickness Calculator

Calculate wall thickness from number of perimeters and nozzle/line width.

Print Time Estimator

Estimate total print time from layer count, speed and travel moves.

Last updated: February 2026

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