How to make a stacked laser cut sculpture from a 3D model

By meshcast.app · Updated November 2026

This guide was drafted with AI assistance.

How a stacked sculpture works

A stacked laser cut sculpture is a 3D shape rebuilt from flat slices. Cut one outline per layer from sheet material, glue the layers in order, and the stack steps up and down like a topographic map. Terrain models, animal heads, busts, vases and logos all work, because any solid can be cut into horizontal slices.

The hard part used to be the slicing. Autodesk retired its free Slicer for Fusion 360, which many makers used to turn a mesh into cut-ready layers. The Meshcast laser STL slicer does the same job in your browser: load an STL, OBJ or 3MF, tell it your material thickness, and it returns the layers as SVG or DXF, packed onto sheets. Designing and previewing are free, and so is your first download.

Step 1: choose a model that stacks well

Not every model makes a good sculpture. Look for these traits:

• A clear silhouette from the side. Stacking reveals form through the stepped edges, so a bold shape such as a bear, a mountain or a skull reads well.
• No thin spikes pointing sideways. A slice through a thin whisker is a tiny island that falls off the stack. Chunky models are forgiving.
• A flat or easily flattened base. The bottom layer is your foundation. Orient the model so the side you want on the table faces down.
• A sensible size. Check the longest dimension against your laser bed and your material sheets.

Hollow or open meshes (a surface with holes in it) slice badly, because the slicer cannot tell inside from outside. If a slice looks empty or inverted, repair the mesh in your 3D software first.

Step 2: set material thickness and layer count

Layer thickness is not a free choice. In a stacked sculpture, one layer equals one sheet of material, so the slicer should use your real measured thickness. Measure with calipers rather than trusting the label: a sheet sold as 3 mm plywood can be a few tenths off, and a stack of 40 layers multiplies that error.

Common sheet thicknesses are 1.5 mm, 2 mm, 3 mm and 6 mm. The trade-off is simple:

Layer count follows directly: model height divided by sheet thickness. A 90 mm tall sculpture in 3 mm material is 30 layers. If that number feels too large for your patience, scale the model down or move to thicker sheets. If the stepping looks too coarse, go the other way.

Step 3: apply kerf compensation

A laser removes a thin strip of material as it cuts, called the kerf. Cut a shape and the part comes out slightly smaller than drawn, because the beam burns away half the kerf on each side. On a flat part that is barely noticeable. Across a stack where every layer should line up with its neighbours, uneven edges are visible.

The slicer can offset each outline by half the kerf so the finished layers match the model. If you do not know your kerf yet, our guide laser kerf: what it is and how to measure it shows a quick test you can cut in minutes. For sculptures where only the outer silhouette matters, a small error is fine. For interlocking or press-fit parts it matters much more.

Step 4: make alignment easy

Gluing 30 near-identical shapes in the right order is where most projects go wrong. The slicer helps in two ways:

• Engraved layer numbers. Each layer has its number engraved on it, so a loose pile of pieces can be sorted back into order. Engraving shows as blue lines (#0000ff) in the SVG while the cut lines are red (#ff0000).
• An outline of the next layer. Each piece carries an engraved outline of where the layer above sits. When you glue, you place the next piece inside that line, which removes guesswork on shapes that look alike.

Place the numbers where the next layer will cover them, or sand them away at the end. If you want a clean finish, test the engrave on a scrap first to see how dark it comes out. For how the colours become machine operations, see laser cut vs score vs engrave.

Step 5: pack the sheets and export

The slicer arranges layers onto sheets so you waste less material. Enter the sheet size you actually have, for example the usable bed area of your machine, and the parts are packed with a gap between them. Export as SVG in millimetres, or as DXF with separate CUT and ENGRAVE layers if your software prefers it. Not sure which? SVG vs DXF for laser cutting explains the difference.

Step 6: cut it

Run engraving first and cutting last, so the sheet cannot shift after parts are free. Use a fresh piece of the same material to run a power and speed test grid before the real job. Lasers vary too much for a number from a guide to be trustworthy, so find the lowest power that cuts cleanly through with a single pass on your own machine.

Plywood and MDF leave soot on the edges and surface. Masking tape on the top face helps, and edges can be wiped or sanded later. Keep the machine ventilated and stay with it while it runs. Never cut PVC or vinyl: it releases chlorine gas that is toxic and corrodes the machine.

Step 7: align, glue and clamp

1. Dry stack first. Stack all layers without glue, in number order, to check nothing is missing or warped.
2. Add alignment dowels. Drill or cut two matching holes through the layers and pass a wooden dowel or bamboo skewer through them as a spine. Two dowels stop the stack from twisting. Place them where they are hidden inside the thickest part of the shape.
3. Glue in small groups. Use wood glue in a thin even coat. Glue five or six layers, clamp, let them set, then join the groups. This keeps squeeze-out under control.
4. Wipe excess immediately. Dried glue shows through stain and paint.
5. Weight it while it dries. Plywood warps, and a flat stack needs even pressure.

Step 8: sand and finish

The stepped surface is the look, so sand to taste. For a smooth organic form, work through coarse to fine sandpaper, then fill gaps with a mix of wood glue and sanding dust. For a crisp terrain feel, only knock off the sharp edges. Seal with varnish, oil or paint. Dark stain highlights the glue lines between plywood layers, which many makers love.

Want a name on the base? Make a small plaque with the laser name sign tool, or turn a PNG logo into cuttable vector art with image to SVG.

Common problems

Made by meshcast.app. More laser tools and guides live on the laser cutter tools hub.