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Why you need a slicer

Your printer cannot read a 3D model directly. It needs step-by-step instructions called G-code - move here, extrude this much, heat to this temperature. A slicer is the software that takes your 3D model, cuts it into hundreds of thin horizontal layers, and writes the G-code your Ender 3 follows. The gold-standard free slicer is UltiMaker Cura, trusted by millions of makers worldwide.
Diagram of a 3D model being sliced into horizontal layers and converted to G-code

A slicer cuts your solid 3D model into hundreds of thin printable layers of G-code

Model file (.stl / .obj) → Cura slices it → printer file (.gcode) → your Ender 3 prints it.

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Install Cura

Go to the official site

Visit ultimaker.com/software/ultimaker-cura and click Download for Free. Choose the installer for your operating system (Windows or Mac).

Run the installer

Open the downloaded file (.exe on Windows, .dmg on Mac). Agree to the terms, then on Windows click Install, or on Mac drag Cura into your Applications folder.

Open Cura

Launch Cura. The first time it opens, it walks you through adding a printer.

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Add your Ender 3

Cura needs to know which printer you have so it uses the right settings and build area.

Add a non-networked printer

Click Add Printer → Non-UltiMaker Printer → Add a non-networked printer.

Choose Creality Ender 3

Open the Creality manufacturer group, select Creality Ender 3, and click Add.

Confirm the machine settings

Cura fills in the Ender 3’s build volume (220 x 220 x 250 mm) and defaults automatically. Accept them.

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A quick tour of Cura

Annotated Cura slicer interface showing the build plate, tools, and print settings panel

The Cura workspace: model on the bed, tools on the left, print settings on the right

Load a model

Drag an .stl file into Cura, or use File → Open. Your model appears on the virtual bed.

Move, scale, rotate

Use the tools on the left to position and size your model on the bed.

Print settings

On the right, set layer height, infill, speed, and supports. Start with the Standard Quality preset.

Slice and save

Click Slice, review the time and material estimate, then Save to Disk or to your microSD card.

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Beginner settings that just work

Diagram comparing thin versus thick layer heights and their effect on print quality

Layer height sets how fine your print looks - thinner layers, smoother surface, longer print

Diagram comparing low, medium, and high infill density inside a printed part

Infill fills the inside of a print - more infill means a stronger, heavier, slower part

Diagram showing support structures holding up an overhang during printing

Steep overhangs need supports - temporary scaffolding you remove after printing

Always make sure the selected printer in Cura is Creality Ender 3 before slicing. Slicing with the wrong printer profile can send bad temperatures or move commands to your machine.
Cura is installed, the Creality Ender 3 is added, and you can load a model, slice it, and save a .gcode file. Next we set up the design software.