Pro STL Slicer
Pro STL Slicer
Split giant 3D models into build-plate-sized parts with printable snap-fit joinery โ then click the whole thing together like furniture. A free tool from the Owl & Twig studio.
๐ Launch the SlicerOpens in a new tab ยท free to use ยท your files are processed in the app session and not kept
Smart grid slicing
Auto-fits cuts to your printer's build volume (Bambu presets built in), with a seam preview so cuts land in natural detail lines.
Point-and-click cut planes
Click anywhere on the model and set any angle to place a cut exactly where you want it โ separate an arm at the shoulder, or follow a natural seam. Joinery orients itself to the cut, whatever angle it is.
Nine connector types
Loose pins print flat with no supports. Snap-fit barbs click and lock, taper locks wedge the seam shut, and six more sit in between โ all with tunable clearance.
Hollow with open bottom
Shell big models to true-thickness walls with an open underside โ huge prints without solid-infill waste. Joint areas stay solid automatically.
Nine ways to join the parts
Pick a connector and the slicer cuts the matching sockets into both halves, then lays the loose pins out on their own print plate. Each pin below is drawn from the same profile the tool actually cuts, so what you see is the shape you get.
Snap-fit barb
Clicks into an undercut socket and locks. The only one that holds the seam shut on its own.
Taper lock
A double cone that wedges as it seats โ pulls the seam closed with no slop at all.
Diamond biscuit
A square standing on its corner. Self-squares as it seats and prints with no supports.
Hex pin
Six flats stop the parts rotating, with six easy ways to line the pin up.
Cross / plus
Stiff in both directions for far less material, and somewhere for glue to go.
Triangular prism
Three faces, three insertion angles, zero rotational play once it's home.
Flat biscuit
Wide and shallow. The one for thin panels and hollowed models.
Round dowel
The classic. Most forgiving to insert โ use two per seam so nothing spins.
No connectors
Bare seams, no sockets. Fastest option when you're gluing or just testing a cut plan.
Pin size, length and socket clearance are yours to set โ 0.15ย mm for a tight press fit, 0.35ย mm to slip together for glue. The preview in the app re-renders as you change them.
How it works
- Upload your STL and pick your printer preset (or exact plate size). Or click one of the built-in samples โ cube, castle, or joint-test โ to try the tool without downloading anything.
- Choose how to cut. Let the auto grid size cuts to your plate, or switch to custom planes and click the model to place each cut yourself at any angle. Either way you see the seams before committing.
- Pick your connector from the nine above, size it, and optionally hollow the model with an open bottom.
- Slice, check the 3D exploded preview, and download one combined STL (in Bambu Studio: right-click โ Split โ To parts) plus a ZIP of individual parts and the loose-pin plate.
Tip: very large scans (800 mm+, 600k+ triangles) run best in the downloadable desktop version โ the hosted app will let you know when a model is too heavy for the free server. If the app appears asleep, click the wake button and give it about a minute.