Cookie Cutter — free online STL splitter for 3D printing

Split 3D models that are too big for your printer into pieces that fit your build plate. Cookie Cutter cuts STL, 3MF, and OBJ files into printable parts with interlocking connectors — dovetail rails, puzzle tabs, or alignment pins — so the printed pieces slide together and glue back into the original shape.

How it works

• Open an STL, 3MF, or OBJ model — nothing is uploaded; everything runs in your browser.
• Pick your printer (Bambu Lab, Prusa, Creality, Anycubic, Elegoo, Voron, and more) or enter a custom build volume.
• Drag the cut planes or set exact positions, choose a connector style, and split.
• Download the pieces as STL files, numbered and engraved for easy assembly.

Free and private

No signup, no upload limits, no watermarks. Your model never leaves your computer — the cutting happens locally using WebAssembly. Loading the app…