Splitting a 3D model into smaller parts makes large prints possible on compact build plates, reduces support material waste, and improves the success rate of complex models — and the best part is, you don’t need dedicated software to do it.
Most modern slicers already include built-in tools that allow you to cut STL files directly. This updated guide covers four of the most commonly used slicers today:
- Bambu Studio
- PrusaSlicer
- Orca Slicer
- Ultimaker Cura
Fortunately, Bambu Studio, PrusaSlicer, and Orca Slicer work in very similar ways. Cura, however, requires a plugin.
Before we dive in, it’s important not to confuse “Cut” and “Split.”
Cut vs. Split: What’s the Difference?
In slicers, the Cut tool works like slicing a cupcake with a knife. It cleanly slices through the entire model along a defined plane, creating two separate parts.
Split, on the other hand, is different.
If your STL file contains multiple independent parts bundled together, you may want to “split” them into separate objects so you can arrange them individually or print only one part.
In this guide, we’ll also cover:
- Split to Objects
- Split to Parts
Additionally, Bambu Studio, PrusaSlicer, and Orca Slicer allow you to add connectors (such as pins, plugs, dovetails, or snap fits) so that printed pieces can be assembled without glue.
Why Split a Model?
Printing a large or complex model as a single piece is not always ideal. Splitting can help when:
- The model exceeds your printer’s build volume
- Large overhangs would require excessive support
- Different sections benefit from different orientations
- Multiple materials are needed
- You want to print in parts and assemble afterward
Splitting models in slicers has become easier than ever — but each tool has its own characteristics.
When You Need CAD Software Instead
Slicers are convenient for basic planar cuts. However, if your model requires:
- Precise structural joints
- Complex separation lines
- Hidden seams
- Accurate tolerances
- Water-tight solids after splitting
Then preparing or splitting the model in CAD software (such as Onshape or Blender) before slicing is often the more reliable solution.
CAD tools provide:
- Greater control and precision
- Custom joint design
- Clean solid geometry
- Better seam placement along contours
Slicers typically perform simple planar cuts directly on mesh data, which may introduce imperfections.
For quick jobs, slicer cuts are convenient.
For functional designs and multi-part assemblies, CAD remains the superior option.
01 — Splitting / Cutting in Bambu Studio
Bambu Studio includes both a Cut tool and splitting options.
Using the Cut Tool
The Cut tool allows you to define a plane that divides the model into two parts.
After cutting:
- You get two printable pieces
- You can keep both parts or discard one
- You can reposition them independentl
Steps
- Import your STL/3MF file
- Select the model
- Activate the Cut tool
- Position the cutting plane (or hold Shift + drag to define a cut line)
- Click Perform Cut
If the parts don’t fit on one plate, use the Arrange tool to move them to separate build plates.
You can manage or export individual parts via the object list.
Adding Connectors
Bambu Studio allows you to add connectors after cutting:
- Plugs
- Pins
- Snap-fit connectors
Click Add Connector, then click on the orange cut surface to place it. You can adjust size and depth afterward.
Note: You can only cut a model into two parts at a time. To create more sections, repeat the process on one of the cut pieces.
Split to Objects
If your STL contains multiple meshes grouped together, use Split to Objects to separate them for individual arrangement and manipulation.
02 — Splitting / Cutting in PrusaSlicer
PrusaSlicer includes a dedicated Cut function similar to Bambu Studio.
It also offers Split to Objects, which applies to multi-part models already bundled together.
Using the Cut Tool
- Import and select your model
- Press C or click the Cut icon
- Ensure Plane Mode is selected (unless you specifically want a dovetail cut)
- Move or rotate the cutting plane
- Adjust exact values in the panel if needed
- Under “Cut Result,” choose: Cut to Objects (independent parts)，Cut to Parts (grouped under one parent model)
- Click Perform Cut
Cut to Parts vs. Cut to Objects
Cut to Parts
- Parts remain grouped
- Move/scale/rotate together
- Slice as one object
- Useful for multi-material or logical grouping
Cut to Objects
- Fully independent models
- Can be moved, duplicated, hidden, or sliced separately
- Ideal for separate printing and assembly
Connectors (pins, plugs, snap fits) can also be enabled before confirming the cut.
03 — Splitting / Cutting in Orca Slicer
Orca Slicer works almost identically to Bambu Studio and PrusaSlicer.
Steps
- Select the model
- Activate the Cut tool
- Adjust the cutting plane (interactively or via numeric input)
- Confirm the cut
The model becomes two independent objects that can be repositioned or exported separately.
Optional connectors (pins, plugs, snap features) can be added before confirming.
Split Function
The Split option is used only when the STL already contains multiple separate shells.
If the Split option is greyed out:
- The model is not selected
- Or it does not contain multiple sub-objects
04 — Splitting / Cutting in Cura
Cura is quite different from the other slicers.
It does not include a native Cut tool in the core software.
Instead, you must install a plugin from the Marketplace called:
Banana Split
How Banana Split Works
This plugin allows you to:
- Move part of the model below the build plate
- Slice only the portion above the plate
Cura will only generate toolpaths for geometry above the build surface.
However:
- It does not create two independent mesh objects
- It does not offer connector options
- It references the build plate plane only
This makes it more of a “print-time trimming” workaround than a true mesh editing tool.
Splitting Multi-Mesh STL Files
To separate bundled meshes in Cura, install another plugin:
Mesh Tools
After installation, right-click the model and choose:
Split Model into Parts
This works only if the STL already contains multiple separate shells.
Final Thoughts
For simple planar splits, modern slicers make the process incredibly easy — especially Bambu Studio, PrusaSlicer, and Orca Slicer, which provide:
- True planar cutting
- Independent mesh objects
- Built-in connector options
Cura can achieve similar results through plugins, but it is less robust for true mesh manipulation.
If you need precision joints, hidden seams, or structural assemblies, CAD software remains the most reliable choice.
For quick adjustments and large model adaptation, your slicer is more powerful than you might think.
