Why is the first layer special?

The first layer must stick firmly to the build plate while establishing a flat, consistent foundation. Settings that work for upper layers often cause poor adhesion on the first layer.

Should the first layer be thicker than other layers?

Usually yes. A thicker first layer (150% of normal) compensates for minor bed levelling imperfections and provides a wider squish for better adhesion. Do not exceed 75% of nozzle diameter.

How slow should the first layer be?

Typically 50% of normal speed (20-30 mm/s). Slower speed gives more time for adhesion and reduces the chance of the nozzle dragging the print loose.

What does first layer flow percentage mean?

Slight over-extrusion (105-110%) on the first layer ensures the filament is firmly pressed into the build surface. Too much causes elephant foot; too little causes lifting.

3DPrintCalcs

First Layer Calculator — Perfect Bed Adhesion

Calculate optimal first layer height, width and speed for strong bed adhesion.

Nozzle Diameter

Nozzle opening diameter in mm

Normal Layer Height

Height of each printed layer

Normal Speed

Speed or rate value

How We Calculate This

Recommendations

First layer height = min(Normal height x 1.5, Nozzle x 0.75)
First layer width = Nozzle x 1.2 (wider for better squish)
First layer speed = Normal speed x 0.5
First layer flow = 105% (slight over-extrusion)

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.