How to split a model in Bambu Studio (A1 mini guide)

I’ve had to do this on my A1 mini. Two oversized pieces of a large tabletop tank didn’t fit, so I split them in Bambu Studio and glued them together afterwards. It worked, but cutting and assembling is extra work I’d rather avoid. So before you cut, check whether you really need to.

First, check that it really doesn’t fit

Anything longer than 180 mm in X, Y or Z won’t print in one piece on an A1 mini, unless it’s long and thin enough to lie across the diagonal. Bambu’s guide to large files says that if a model exceeds “even one of the dimensions” of the build volume, it has to be split or scaled.

To check, select the model and read the size in the object panel on the right, as Bambu’s guide shows. The Measurement tool in the top toolbar measures any section you click.

Long, flat parts get a second chance. The bed is 180 mm along each edge but about 255 mm corner to corner, because a square’s diagonal is its side times 1.414. A part that has width uses up some of that. A strip 20 mm wide can be up to about 235 mm long on the diagonal. Rotate it 45° with the Rotate tool (R) and see whether Studio still flags it.

Source: Bambu Lab A1 mini tech specs, checked October 26, 2026. Note: the diagonal lengths are our geometry (180 × √2 = 254.6 mm, minus the part’s width) for a flat part. Bambu Studio’s warning has the final say.

Studio’s auto-arrange can also be fussy with near-full-size parts. In a 2024 Bambu forum thread, one user found the Arrange button kept placing 178 mm parts beside the A1 mini’s bed. A reply’s tip worked for him: right-click the object and choose Arrange, which centered even a 180 × 180 mm cube. Studio has had many updates since, so treat that as a workaround to try, not a known bug.

Scale it, split it, or print it bigger

Scale it down if the exact size doesn’t matter, and split it if it does. When you import something too big, Bambu Studio asks: “Your object appears to be too large, Do you want to scale it down to fit the heat bed automatically?” Saying yes is fine for a display piece.

Scaling shrinks everything, though. Holes meant for screws, pegs meant to fit another part and slots sized for a magnet all shrink with the model. Why scaled holes stop fitting gets its own article later this month.

Splitting keeps the size, at the cost of a seam and an assembly step. How many pieces you need depends on how far over the limit the model goes. Bambu’s own example in its large-files guide is a Venus de Milo model about 449 mm tall.

Source: Bambu Lab Wiki, A Guide to Splitting and Printing Large Files in Bambu Studio; A1 mini tech specs and A1 tech specs; A2L (330 × 320 × 325 mm, W × D × H) from Bambu Lab’s A2L tech specs, checked October 26, 2026. Note: piece counts are our arithmetic (449 ÷ height, rounded up) and assume the width already fits.

If most of what you want to print looks like that, a bigger bed is the real fix. On Bambu’s US compare page on October 26, 2026, the A1 mini cost $219 and the A1, with its 256 mm cube, $299. We’ll compare the two properly in a separate A1 mini vs A1 article later this month. My own view: splitting the occasional model is manageable, but doing it over and over would get old.

How to cut a model in Bambu Studio

The whole job takes place in the Cut tool, and these steps follow Bambu’s cut tool page and its large-files guide.

Import and set up. Drag the file in or use File > Import. Pick the A1 mini as the printer and set your filament, so the plate on screen is the right size.
Open the Cut tool. Select the object, then click Cut in the toolbar or press C.
Place the plane. Planar mode is the default. Choose the X, Y or Z axis and drag the plane, or type a Height (the absolute height of the plane’s middle, available when the plane is parallel to the bed). Grab a handle to rotate it, or type degrees. Holding Shift while you drag draws a plane perpendicular to your current view.
Add connectors. Click Add connectors, pick Plug, Dowel or Snap, and set the style, shape, depth ratio and size. Click on the cut face to place each one, then click Confirm connectors.
Choose what happens after. Keep both halves (Object A and Object B) or switch one off. Set each piece to Keep orientation, Place on cut or Flip.
Perform the cut. If Studio warns about non-manifold edges, accept its offer to repair the model before slicing.
Repeat if needed. Select a piece that’s still too big and cut it again.
Lay out and print. Use Arrange, or Add Plate (up to 36 plates per project) and drag pieces onto their own plates. Then Slice all. Bambu’s multi-plate guide says sending every plate as one queue doesn’t work on the A series yet, so on an A1 mini, send each plate as its own job.

Where you cut matters as much as how. Bambu’s guide suggests looking for overhangs and for segments that can lie flat before you cut. Its troubleshooting list adds two points. Print cut faces flat on the plate, so supports don’t grow on the faces that have to meet. And use the same layer height, orientation and settings for every piece, so the seam doesn’t show a ridge.

Plug, dowel, snap or dovetail

Use dowels when you want both pieces to print cut-face down. Use a plug or snap when one piece can carry the peg. Use dovetail mode when the parts need to slide together and stay aligned.

Bambu Studio is based on PrusaSlicer, and Prusa’s knowledge base describes the same three connectors. A plug adds a peg to one side and cuts a matching hole in the other. A dowel cuts holes in both sides and adds a separate pin as an extra object to print. A snap adds a snap-fit peg to one side and the space for it on the other.

Source: Prusa Knowledge Base, Cut tool; Bambu Lab Wiki, Cut Tool, checked October 2026. Note: shapes simplified; the gap around each peg is the clearance the connector’s tolerance setting controls.

Joint	What Studio makes	Good for	Watch out for
Plug (default)	A peg on one part, a hole in the other	Quick alignment where one piece can stand on its other end	The peg side can’t lie on its cut face without supports
Dowel	Holes in both parts, plus a pin to print	Both pieces printed cut-face down, flat and clean	One more small part to print and keep track of
Snap	A snap-fit peg and a matching space	Pieces that click together	Thin pegs can snap; Bambu suggests printing connectors with extra wall thickness
Dovetail mode	An interlocking dovetail along the cut	Parts that must line up exactly; Bambu says it suits functional models	Studio may report non-manifold edges to fix after the cut
Planar, no connector	Two flat faces	Glue-only joints on wide faces	Nothing to line the pieces up while the glue sets

The “Good for” column on the plug and dowel rows is our reasoning from how each joint is built: a peg sticking out of a cut face would need supports if that face went on the plate. Bambu’s wiki explains the dovetail settings. Depth sets how far the joint reaches into the model. Width sets the dovetail’s base, Flap angle how sharply its sides flare, and Groove angle the matching slot.

If connectors come out too tight or too loose, Bambu’s large-files guide says to set the cut tolerance to 0.15 to 0.3 mm and recalibrate flow. It also says to sand tight pegs rather than force them. Those tolerance fields get a full explanation in a separate article on connectors that won’t fit.

Which glue holds PLA parts

For PLA display pieces, use super glue. For a joint that takes load, use two-part epoxy. That’s the gist of Bambu’s advice, which appears on two wiki pages with slightly different emphasis.

Glue	When Bambu suggests it	The catch
Super glue (cyanoacrylate)	PLA and PETG where the bond doesn’t need to be strong; the large-files guide calls it “an ideal choice” for PLA	Bambu says it handles cold and age poorly, and can crack and lose strength
Glue made for the filament	A PLA-specific glue for PLA parts	Check that it names your material
Two-part epoxy	High-strength joints, and PETG or ABS parts	Bambu says to read the instructions, as the materials it suits vary
Hot melt glue (EVA)	Rough filled filaments like PAHT-CF that standard glues won’t hold	Needs heat on the part; Bambu warns about burns and warping

Dry-fit everything before any glue goes on. Bambu’s guide says to sand pegs or holes lightly if they bind, starting at 220 grit, and not to force them, which can crack the part. Clean and sand the joint faces too; the guide blames failed joints on the wrong glue or dirty surfaces.

Then press the parts together for 30 to 60 seconds, or clamp them. Fill any seam with plastic putty or super glue and sand it smooth. If you plan to paint, a coat of primer shows up the gaps you missed.

What to do next

Check the model’s size in Studio’s object panel. If one dimension is just over 180 mm and the part is thin, try rotating it 45°.
Decide what matters more, size or simplicity. If it’s a display piece, accept Studio’s offer to scale it down.
Cut with connectors. Pick dowels if you want both pieces printed cut-face down, then dry-fit before you glue.
Put each piece on its own plate with the same layer height and settings, and send the plates one at a time.
Glue with super glue for display pieces or two-part epoxy for parts that take load. Clamp the joint, then fill and sand the seam.

How this guide was made

Lijo’s part is his own A1 mini print: the two tank pieces he split in Bambu Studio and glued, and his view on splitting the odd model. His notes don’t say which connector or glue he used, so the cutting and gluing advice comes from the documentation, not from that print. Everything else comes from Bambu Lab’s wiki and spec pages, Prusa’s knowledge base, Bambu Studio’s source code and one Bambu forum thread, all opened in October 2026. Nothing else here is first-hand. Prices are Bambu’s regular US prices, checked October 26, 2026.

Model too big for your A1 mini? How to split it in Bambu Studio