3D printing & CAD · Beginner

Slicer

The program that turns a 3D model into layer-by-layer print instructions

What is a slicer in 3D printing?

A slicer is the program that turns a 3D model into printing instructions. It cuts the model into thin horizontal layers, plans the path the nozzle or light takes for each one, adds supports and infill, and saves a file the printer can run.

Think of it like this

Like a deli slicer cutting a loaf into even slices, then writing down exactly how to stack them back into the same shape.

Where it fits in a 3D project

  1. Create
  2. Surface
  3. Rig
  4. Animate
  5. Render
  6. Export

Export: Saving and sharing the result: file formats, engines and printing.

How a slicer works

  1. 01Import an STL, OBJ or 3MF model and place it on the virtual bed.
  2. 02Choose a printer profile, material, layer height and infill.
  3. 03The slicer cuts layers, plans paths and adds supports where needed.
  4. 04Preview each layer, then export the print file or send it to the printer.

Where a slicer is used

  • Preparing every model for an FDM or resin print
  • Estimating print time and material use
  • Spotting problems layer by layer before printing

Beginner tip

Always scroll through the layer preview before printing. It shows gaps, floating parts and missing supports that are hard to spot in the 3D view, and it takes seconds.

Terms related to a slicer

Slicer FAQ

What does a slicer do?
It converts a 3D model into layer-by-layer instructions for a printer. Along the way it sets wall thickness, infill, supports, speeds and temperatures, and estimates the print time and material use.
Which slicer settings matter most?
For beginners: layer height, infill percentage, supports, and the nozzle and bed temperatures for your material. Start from your printer’s default profile and change one setting at a time.
Is slicer software free?
Most popular slicers are free, and many printer makers ship their own. Common free options include PrusaSlicer, Cura and OrcaSlicer, which support printers from many brands.

Updated October 29, 2026 · Browse all 3D terms