Cut and score settings for living-hinge boxes: plywood, MDF and acrylic
Starting points for cutting hinge boxes on xTool, Glowforge, Omtech and other CO₂ and diode lasers, which layer runs first, and the two settings that matter most for a hinge that bends.
8 min read
A hinge box asks two things of your laser that a sign or a coaster does not: a thousand short cuts in a row, and links between them that must stay strong. Here is how to set up for that on the machines most makers use, and the order to run the layers in.
The file, layer by layer
| Layer | Colour | What it is | Setting |
|---|---|---|---|
| Score | Blue, #0000FF | Lid art, tab and seam marks on the base | Line, light power, fast. Run first. |
| Cut | Red, #FF0000 | Part outlines, slots, every hinge slot | Line, full-depth cut. Run second. |
| Boundary | Black, #000000 | Your sheet outline | Output off. |
The DXF carries the same three as layers named CUT, SCORE and BOUNDARY. Both files are drawn 1:1 in millimetres, so import at 100% and check that the sheet boundary measures what your preset says (420 × 297 mm for A3). See importing into LightBurn and xTool Creative Space for the clicks.
Two rules for the hinge
- Slow down rather than power up. Links are 1–2 mm bars. Excess power chars their sides, and charred wood has no strength. Find the lowest power that cuts through at a moderate speed, with air assist on.
- Keep the focus right. A beam focused on the surface gives the narrowest kerf and the cleanest link walls. Re-focus when you change thickness, and shim a warped sheet flat with masking tape at the corners.
Starting points by machine
These are places to start, not answers: every tube, lens and sheet of plywood differs. Begin from your machine's own 3 mm plywood preset if it has one, cut the free bend test, and adjust from there. Speeds are in mm/s.
| Machine | 3 mm Baltic birch, cut | Score (lid art) | Notes |
|---|---|---|---|
| Diode 10 W (xTool D1 10W, Atomstack A10, Ortur LM3) | 100% power, 3–5 mm/s, 1–2 passes | 15–25%, 60–100 mm/s | Air assist is not optional on hinges. Expect 20–40 minutes for a 150 mm box. |
| Diode 20 W (xTool D1 Pro 20W, Creality Falcon2 22W) | 100%, 6–9 mm/s, 1 pass | 12–20%, 80–120 mm/s | Two passes at 12 mm/s often leave cleaner links than one at 6. |
| Diode 40 W (xTool S1 40W, Falcon2 40W) | 100%, 10–15 mm/s | 10–15%, 100–150 mm/s | Use the xTool S1 bed preset for nesting; the material library's basswood or plywood entry is a fair start. |
| CO₂ 40–50 W (K40, Omtech 40W, Monport 40W) | 50–70%, 10–15 mm/s | 8–12%, 150–250 mm/s | Cheap tubes lose power with age; if links char, drop power before dropping speed. |
| CO₂ 55–80 W (xTool P2, Omtech 60/80W, Glowforge Pro) | 45–65%, 15–25 mm/s | 8–10%, 200–300 mm/s | Glowforge: start from Proofgrade Medium Plywood settings and set the blue layer to Score. |
By material
- Baltic birch plywood, 3 mm. The reference material. Clean links, bends to the tightest catalog curves. 4 mm and 6 mm need proportionally more power and the bigger corner radii the Studio applies for them.
- Poplar and basswood plywood. Softer, cuts faster, slightly weaker links. Cut the bend test; you may want Wood flex at 70%.
- MDF, 3 mm. Fine for base and lid. For the wall, only gentle shapes (round, rounded box, squircle) and Wood flex at 70%. It produces a lot of fine dust and smell; good extraction matters.
- Acrylic. Base and lid only. Do not cut the hinge from acrylic.
Grain and orientation
Plywood is cross-laminated, so it bends either way, but the face veneer is the layer that tears first. Lay the wall strip so the face grain runs along the strip (round the box), and the veneer bends with its fibres rather than across them. The Studio nests the wall strips along the long side of the sheet, which is how most plywood is sold grain-wise; if your sheet is the other way, rotate the parts in your laser software before cutting.
Questions
Should I cut the hinge with one pass or two?
One clean pass if your laser can manage it, at the slowest speed that still cuts through. Two fast passes burn less per pass and leave cleaner links on weak diode lasers, but they double the time on a hinge with a thousand cuts and risk slight offsets. Try both on a bend test strip.
Do I need to mask the wood?
Masking tape keeps smoke stains off the face, which matters for a gift box. Keep it off the hinge area if the strip pulls fibres when you peel it; on the hinge a light sanding after assembly works better.
Can I cut the box from acrylic?
The base and lid, yes. The hinge, no: acrylic has no fibres to twist and shatters at a fraction of plywood’s strain. Cast acrylic will manage a very gentle, one-time bend with heat, but it is not what this engine is built for.
Why does the score layer run first?
Scoring is a light pass that marks fold lines, tab positions and the lid art. If the cut runs first, pieces fall and shift before they are marked. Run blue first, then red.
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