Check the source dimensions
Select an ASCII or binary STL and compare its displayed size with your design. An STL file splitter cannot infer units: a coordinate value of 25 is treated as 25 mm, with no automatic rescaling.
SIZE YOUR PARTS FOR THE BUILD VOLUME
STL splitter for your printer.
Set dimensions and clearance.
Use this free STL splitter to divide an oversized model without shrinking it. Choose your printer’s build volume, allow space around the edges, and preview the resulting grid before saving separate pieces for printing.
Real, capped geometry 100% local file processing Free to use, no sign-up
LOCAL WORKSPACE Your files stay on your device
01
Your model
.STL02
Split settings
No upload. No account. No installation.
ROOM FOR YOUR NEXT BIG IDEA
Add a model to make it fit.
XYZmm
Drag to rotate · Scroll / pinch to zoom
Waiting for a modelScale 1:1 · mm
All cuts run on your device
Model dimensions are read in millimeters; convert inch-based designs before loading.
FROM PRINTER DIMENSIONS TO A CUTTING GRID
Fit a model using the STL splitter
Enter the usable build volume
Choose a preset or enter X, Y and Z limits. The STL splitter uses these dimensions in the model’s existing orientation. Add edge clearance for the space you need to reserve on each side.
Inspect, then export
Run the split and examine the exploded preview. Highlight narrow sections before downloading. Save individual binary STL files or a ZIP containing every occupied cell; the preview spacing does not move exported geometry.
WORKED EXAMPLE: 300 × 100 × 80 MM
How the STL splitter calculates a printer-fit grid
Take a 300 × 100 × 80 mm model and a printer with a 256 × 256 × 256 mm build volume. With 2 mm clearance on each side, every usable axis is 256 − 2 × 2 = 252 mm. Divide each model dimension by 252 and round upward: ceil(300/252) = 2, ceil(100/252) = 1, ceil(80/252) = 1. The result is a 2 × 1 × 1 grid. For a rectangular solid, that makes two 150 × 100 × 80 mm pieces. This calculation illustrates dimensions, not a completed print test.
To split STL for 3D printing, budget for more than bare geometry. This STL splitter does not rotate pieces, arrange a bed or reserve space for supports automatically. Import each result into your slicer, choose a stable orientation and check brims and printer keep-out zones before committing to the job.
Input and grid limits
The STL splitter accepts files up to 120 MB (120 × 1024 × 1024 bytes), at most 2.4 million triangles and no more than 64 grid cells. Dense meshes can still exceed available browser memory; simplify a copy when necessary.
Closed solids, including cavities
Use this 3D model splitter with watertight solids. Cut walls are capped while hollow interiors remain empty. Open surfaces and inconsistent edges need repair first; the tool is not a general-purpose mesh repair service.
Automatic dimensions, chosen seams
You can automatically split STL file geometry from the entered printer dimensions, but the grid does not recognize decorative details or strong joints. Examine where each plane crosses thin walls and visible surfaces before exporting.
A plan for joining
Flat faces can be glued after printing. Choose adhesive for your material and test its fit on scrap. Pins, sockets, magnet holes and glue gaps require your own CAD work; this version generates none of those connectors.
ON YOUR WORKBENCH
Choose a cutting plan for the print you need
Props & display pieces
Divide an oversized shell or prop into manageable sections. Leave the flat joining faces accessible for assembly.
A section before the whole
Use the manual STL cutter to isolate a portion for a fit check. Download only the side you want to test.
A deliberate part layout
Split STL into planned parts with a regular grid, or make two centered halves for a single joining seam. Inspect thin sections before committing.
FOUR WAYS TO START
A different cut for a different job.
Fit to printer
Divide by your printer’s build volume.
STL cutter
Place one precise axis-aligned cut.
Split STL into parts
Choose an equal-width grid of parts.
Cut STL in half
Split at the center on X, Y or Z.
SIZING, SAVING AND FAILED INPUTS
STL splitter questions before you print
Read about the tool’s processing method and its file-handling policy.
Can I split STL online without sending the model?+
Yes. This STL splitter reads, cuts and exports inside your browser, without a model upload or account. Closing the tab ends the workspace; keep the original file and save any results you need before leaving.
When should I split large STL models another way?+
If a grid crosses a fragile feature or creates an awkward visible seam, choose a deliberate plane instead. The linked cutter lets you position that cut; the part-grid mode suits a layout you have already planned.
Does the STL splitter guarantee a printable result?+
No. A sealed mesh still needs suitable wall thickness, support and orientation. Check the slicer’s layer preview for missing islands, unexpected filled cavities and sections that would start in midair.
Can I split STL file copies again later?+
Yes. Keep the source and your settings so you can make a different grid. Repeatedly cutting exported pieces is possible, but planning the complete layout first makes filenames and reassembly easier to manage.
What if the browser rejects my model?+
Check the file limit, triangle count and error message. Repair non-manifold edges or openings in a modeling application, then retry with a smaller copy. A more powerful device may help with memory pressure, but cannot repair invalid geometry.