What Is Nesting in Laser Cutting and How Much Material Does It Save?

There is a particular sting in looking at a sheet of plywood after the job: twelve neat parts, and a lattice of leftover wood between them that is too thin to use and too pretty to throw away. Nesting is the craft of making that lattice smaller.

Nesting is the process of arranging the outlines of parts on a sheet of material so the parts fit tightly, leaving the least possible waste. It can be done by hand, by simple grid layout, or automatically by software that rotates and interlocks shapes.

How much does nesting save?

No honest number fits every project, since it depends on part shape. What we can give you is how the saving behaves.

A circle in a square grid covers about 78.5% of its cell (π ÷ 4). Staggered rows can reach roughly 90%, a general geometry fact, which shows why even a plain shape gains from smarter placement.

Factors that decide your result

• Shape concavity: deep notches create fillable gaps.
• Rotation freedom: allowing 90 or any angle helps, but check the wood grain (see below).
• Spacing between parts: 2–3 mm for 3 mm plywood on CO2, 3–5 mm on a diode laser where charring spreads.
• Sheet size and margins: keep 5 to 10 mm from the sheet edge.
• Part mix: different sizes on one sheet often beat repeating one size.
• Common-line cutting: two parts sharing an edge are cut by one line, which saves time and wood. It only works for straight, matching edges and needs care with kerf.

Worked example: reindeer ornaments

Our reindeer ornament is 90 × 124 mm. With a simple grid and 5 mm gaps, the table below is what fits:

That 84% is the area of the rectangles around the parts. The reindeer itself covers much less than its rectangle, because the space between the antlers and legs is empty. Nesting software can slot a second reindeer into that space, which is where an extra piece or two per sheet may appear. We do not claim a fixed figure; test with your software and file.

How to nest, step by step

1. Import all parts at their final size. See how to scale laser files.
2. Set spacing to match your laser and material.
3. Decide on rotation: free for acrylic, restricted for plywood grain.
4. Run auto-nest, or place parts by hand.
5. Check cut order (inside shapes before outside) and that no part overlaps.
6. Cut a test sheet before the full batch.

Dedicated nesting software is built for this job: it fits parts on a sheet automatically to save material. Some laser programs include a basic arrange function that does grid and some rotation.

Pro tip: keep a bin of your offcuts. A good nesting setup lets you nest small parts into the leftover shapes of previous jobs.

Common mistake: nesting parts so tightly that the kerf and burn marks merge them. On a diode laser, charring and flare can discolour or even fuse neighbouring edges. Leave at least 3 mm between parts unless you intend a shared cut.

Grain, strength and looks

Plywood has a grain direction in the face veneer. Thin parts such as antlers snap more easily across the grain. If you rotate a delicate part freely for tighter nesting, you may trade material for broken tips. Mark fragile parts as "no rotation" or align them with the grain. For acrylic and MDF this concern is smaller.

Next step

Take the part you cut most often, put 9 or 18 of them on a sheet in your software, and compare the layout with an auto-nest. Count the parts, note the sheet area used, and keep the better layout as a template. For more ways to cut waste, read about reducing plywood waste.