How to cut or split a model in Bambu Studio

By Ned Walsch · Published May 11, 2026 · Updated November 9, 2026 · 5 min read

Bambu Studio (and its fork OrcaSlicer) has a built-in Cut tool for the simple case: split a model into two pieces along one plane, with alignment connectors or a dovetail joint. For many "this model is too big" situations that is exactly what you need. When the model is too big on two axes, needs more than two or three pieces, or needs joinery beyond a dovetail, the Cut tool runs out, and a pre-processing step is faster.

This article covers both: how to use Bambu Studio's Cut tool well, where its limits sit, and how to extend the workflow for models that need more.

The Cut tool, step by step

1. Load your STL or 3MF via File → Import, or by dragging it onto the build plate.
2. Click the model to select it. The model gets a coloured highlight.
3. Open the Cut tool. In Bambu Studio, it's in the left-side toolbar — the icon that looks like a model being sliced by a horizontal plane. The keyboard shortcut is C.
4. Position the cut plane. A plane appears through the model. Drag the centre handle along the plane's normal, type a relative Movement in mm, or type an absolute Height (when the plane is parallel to the bed). Drag an axis handle, or type degrees, to rotate it. Shift-drag draws a plane perpendicular to the current view. For printing you usually want the cut horizontal so each piece lies flat.
5. Choose a joint (optional). In Planar mode you can add Plug (a peg on one side, a socket on the other), Dowel (sockets on both sides plus a separate pin to print) or Snap connectors. Or switch the cut mode to Dovetail, which puts a trapezoidal pin on one part and a matching tail on the other, with depth, width, angles and tolerance settings.
6. Click Perform cut. The model splits into two objects (or one multi-part object, if you chose that). Both parts are kept by default; untick Object A or Object B to discard one. "Place on cut" or "Flip" sets the new parts cut-face down.
7. Slice and print. Bambu Studio handles the build-plate arrangement automatically.

The three problems people hit

Problem 1: the model is too big on two axes

The Cut tool cuts one plane per operation. If your model is too tall and too wide, you cut it once horizontally, then select each half and cut again vertically — four operations for a 2 × 2 grid, with the connectors on each cut placed independently. It works, but nothing checks that every resulting piece fits your plate.

For 3-or-more piece splits, the workflow becomes tedious. Use splicestl instead to generate the whole grid in one operation, then load the pre-split pieces into Bambu Studio for slicing.

Problem 2: the joint options stop at plug, dowel, snap and dovetail

Plug, Dowel and Snap are alignment features sized for glue-up; the Dovetail mode is a real interlocking joint, but it is the only one. There is no finger joint for long glue seams, no magnet pocket for a take-apart assembly, no large single tenon, and no way to make the cut surface itself interlock (wave, zigzag, brick, pyramid).

The square peg joinery that splicestl generates is structural: pegs are 8 mm long by default, with the socket sized for a 0.2 mm press fit. The pieces lock together without glue, and adding glue makes the joint permanent.

Problem 3: the Cut tool does not know your build volume

Nothing in the Cut tool reads the printer profile and says "this needs two cuts on X and one on Z". You work out the piece count and positions yourself, cut, then check each piece against the plate. A splitter that starts from the build volume — pick the A1 mini preset and it computes the grid — removes that arithmetic, and the engraved piece IDs and assembly diagram matter once you are past three or four pieces.

When Bambu Studio's Cut tool is the right choice

• Simple two-piece splits. A model that's just slightly too tall for your A1 mini? Cut horizontally, print both halves, done.
• Disposable models. Calibration prints, throwaway tests, models you'll print once and not need to re-cut.
• Bambu A1/X1/P1 ecosystem users. If you live entirely in Bambu Studio, the round trip through an external tool adds friction that's not worth it for one-time splits.

When to use splicestl first

• Multi-axis splits. Anything that needs more than one cut to fit your build plate.
• Joinery beyond a dovetail. splicestl offers seven modes — square press-fit pegs, dovetails, tenon/mortise, finger joints, magnet pockets, dowel holes, screw joints, or none — against Bambu Studio's Plug / Dowel / Snap connectors and dovetail cut.
• Interlocking cut surfaces. splicestl can emit wave, zigzag, sawtooth (asymmetric ratchet that locks slide direction), brick-stepped, or 2D pyramid cuts that resist sliding even without pegs. Useful for clean visible joints or shear resistance on long faces.
• Multiple printers. If you want to distribute the print job across an Ender 3 plus a Bambu A1 mini plus an X1 Carbon, the build-plate dimensions are different for each — splicestl ships 152 printer presets, lets you save custom printers, and includes a print farm mode that auto-balances allocation by speed so the slowest printer doesn't bottleneck the job. Multi-material setups can set per-printer filament prices ($/kg) for accurate cost estimates.
• Cost + time estimates. Set filament price (USD/kg), infill %, and effective throughput (mm³/s) — splicestl shows total filament weight, print time, and dollar cost. In farm mode, the cost summary breaks down per-printer so you know exactly what each machine costs to run.
• Repeating the same split across many similar files. splicestl persists your settings (max sizes, peg sizing, cut shape, printer preset, farm config) in localStorage so they stick across sessions — drop the next file and the same configuration applies.

The combined workflow

1. Open splicestl in a browser tab.
2. Drop the STL or 3MF. Pick your Bambu printer from the preset dropdown (A1 mini, A1, P1S, X1, X1 Carbon all included with their stock build volumes).
3. Optionally drag a cut plane in the 3D view to fine-tune position, or pick "N pieces per axis" if you want exactly 3 stacks instead of "whichever fits the plate".
4. Download the resulting zip.
5. In Bambu Studio: File → Import the pieces in one go.
6. Slice as a single multi-part print.

The pre-split pieces already have joinery, are sized to the preset you picked, and slice with no further setup. From "this model is too big" to "Bambu Studio is slicing" takes a minute or two.

One caveat: AMS color changes across pieces

If you're printing a multi-color model split into multiple pieces, the AMS (Bambu's automatic material system) treats each piece as a separate model. Colors painted on the original STL transfer correctly to each piece, but you may need to verify the per-piece color assignments after import. Open each piece individually in the Bambu Studio paint view to confirm.

Summary

Bambu Studio's Cut tool handles single-plane splits well — fast, native, with alignment connectors and a dovetail option. For anything more (several axes, automatic fit, joinery beyond a dovetail, interlocking surfaces, repeatable settings across many files), pre-process with splicestl and load the results into Bambu Studio. The two tools are complementary, not competitive.

What changed — 9 November 2026: Added how Cut differs from Split to objects and Split to parts, the two things people mean by "split" in Bambu Studio.

What changed — 13 October 2026: re-checked against the Bambu Lab wiki — the Cut tool has Plug / Dowel / Snap connectors (not "dowel, snap") and a Dovetail mode, and the plane can be positioned by exact Height, so the earlier "not millimetre-perfect" claim was removed. Added the quick answer, sources, and the full FAQ in visible form.