Start nesting laser cut parts to save material: part spacing, margins, free nesting tools, shared cut lines and kerf, cut order and smarter use of offcuts.
Material is often the biggest running cost in a laser workshop, and a lot of it ends up in the offcut bin. Nesting laser cut parts to save material means arranging the pieces on the sheet so they sit as close together as possible, with as little waste as you can manage. Done well, it can let you fit more parts on each sheet, shorten cut times and leave offcuts that are still useful. This guide covers manual and automatic nesting, safe spacing, shared cut lines and the mistakes that cost more than they save.
Why nesting matters
Every sheet you buy is a fixed cost. If parts are scattered across it with big gaps, you are paying for wood or acrylic that becomes scrap. Good nesting helps in three ways:
More parts per sheet. Fewer sheets bought for the same order.
Shorter travel. Parts close together mean the head moves less between cuts.
Better offcuts. Waste collected in one corner leaves a usable rectangle instead of a lace of thin strips.
It is worth spending a few minutes on layout for any job you will cut more than once. For a one-off, a quick tidy-up is often enough.
Nesting laser cut parts to save material: the basics
Start with these rules, whichever software you use.
Know your usable sheet size. Measure the actual sheet, then subtract a margin of about 5 to 10 mm on each side for clamps, warped edges and uneven factory cuts.
Set a minimum gap between parts. For 3 mm wood, a gap of about 2 to 3 mm is a common starting point. Thin gaps let heat build up and can burn or weaken the strip between parts. Thicker material and acrylic usually need a little more.
Place large parts first. Put the biggest panels along one edge, then fill gaps with small parts.
Rotate parts. A 90 or 180 degree turn often lets an awkward shape slot in beside another.
Respect grain direction. On plywood and solid wood, some parts look better or bend better with the grain running a certain way. Lock rotation for those parts.
Keep small parts away from sheet edges. Tiny pieces near a warped edge are the most likely to be cut badly or fall through the bed.
Manual nesting in common software
Manual nesting is just careful arranging, and every design program can do it.
LightBurn: use Align, Distribute and the Grid Array tool to place repeated parts quickly. Check whether your version includes an automatic nest feature; recent versions have added more layout options.
Inkscape: the Align and Distribute panel and the Arrange dialog help with rows and grids. Snapping to object bounding boxes makes tight spacing easier.
Illustrator and CorelDRAW: use smart guides and the transform tools to repeat parts at a fixed spacing.
For repeated items such as coasters or ornaments, a neat grid at a fixed gap is usually close to the best you can do by hand.
Automatic nesting tools
For many irregular shapes, automatic nesting saves time. Free tools such as Deepnest and SVGnest take an SVG of your parts and a sheet outline, then rotate and pack the parts to reduce waste. Some laser and CAM programs include similar features.
A good workflow:
Export your parts as SVG, keeping layer colours: red #FF0000 for cut, blue #0000FF for engrave, green #00FF00 for score.
Set the sheet size and part spacing in the nesting tool.
Allow rotation in steps of 90 degrees, or lock it for grain-sensitive parts.
Run the nest, then check the result. Automatic tools sometimes separate engraved detail from its outline if they are not grouped.
Import the nested layout into your laser software and check the scale, then run a frame or outline trace before cutting. Our guide on how to import an SVG into LightBurn covers scale checks.
Files from the Digital Creation laser cut tool come with every sheet already laid out and a cutting guide, but if you are cutting several products at once, you can combine their SVG or DXF parts into one nested sheet.
Shared cut lines: a useful trick with a catch
When two parts have straight edges facing each other, you can place them so they share a single cut line. One pass of the laser separates both, saving material and time. This is called common-line cutting.
The catch is kerf. A shared line removes one kerf width instead of two, so if your parts were designed with kerf allowance on each edge, the pieces may come out slightly larger or smaller than intended. Our explanation of laser kerf shows why. Use shared lines for:
Simple rectangles and strips where a fraction of a millimetre does not matter
Parts where both shared edges were designed for the same kerf offset
Avoid them for joint edges, such as finger joints or tab and slot joints, where the fit depends on exact sizes.
Also delete the duplicate line. Two overlapping cut lines mean the laser cuts the same path twice, which widens the kerf and can scorch the edge.
Cut order and heat
Tight nesting packs heat into a small area.
Cut inner shapes first. Holes and inner details should be cut before the outer outline, so the part does not shift once it is free. Most laser software can do this automatically.
Spread the order. If parts are very close, let the software optimise the order so it does not cut neighbouring outlines one after the other.
Use air assist. It clears smoke between tight gaps and reduces flare-ups.
Stay with the machine. Never leave a laser running unattended. Keep the extractor on and a fire extinguisher close.
Using offcuts
Good nesting pushes waste into one area, so the offcut is still a useful shape.
Store offcuts flat and label them with material and thickness.
Keep a small "scrap" file of useful parts, like coasters, keyrings, test strips and spacers, and nest them into leftover areas.
Use offcuts for kerf tests and power tests before starting a new sheet. See our laser cutting plywood guide for why every batch of plywood is worth testing.
Common nesting mistakes
Gaps too small. Strips between parts burn through or warp. Increase spacing slightly.
Duplicate lines. Overlapping outlines get cut twice. Use your software's delete duplicates function.
Lost engraving. Engrave fills were not grouped with their parts and stayed behind during nesting. Group them before nesting.
Ignoring the margin. Parts placed right to the edge get cut short if the sheet is not square. Keep a margin.
Scale changed during export. Always check one known dimension after importing the nested file.
Mirrored parts. Some nesting tools can flip parts to fit them in. That reverses any engraved text and puts the good face on the wrong side. Turn off mirroring for parts with engraving or a show face.
Quick checklist
Usable sheet size measured, margin set
Gap of about 2 to 3 mm for 3 mm wood, more for thicker sheets
Grain-sensitive parts locked
Engravings grouped with outlines
Duplicate lines removed
Inner cuts before outer cuts
When you need fresh parts to nest, the laser cut file generator can produce boxes, trays, coasters and signs in S, M, L or XL, ready to combine onto one sheet.
Frequently asked questions
How much space should I leave between laser cut parts?
About 2 to 3 mm is a reasonable starting point for 3 mm wood. Thicker sheets and acrylic usually need a bit more to avoid heat damage.
Is there free software for nesting laser cut parts?
Yes. Deepnest and SVGnest are free tools that pack SVG parts onto a sheet. Many laser programs also have grid and array tools for repeated parts.
Should I use shared cut lines?
Only for simple parts where tiny size changes do not matter. Avoid them on joint edges, because sharing a line changes how kerf affects the final size.
Does nesting make cutting faster?
Usually, yes. Parts closer together mean less head travel. Cut time depends mostly on the total length of lines, so nesting saves more material than time.
Laser kerf explained simply: why cut parts come out smaller than drawn, typical kerf values by material, and three ways to compensate for tight joints.
