Laser accessories
Honeycomb Beds and Laser Workholding: Flat Stock, Clean Backs, No Flare
Updated July 7, 2026
Half of 'my laser won't cut through' complaints are really workholding problems: warped plywood lifting out of focus, smoke with nowhere to go, and flashback scorching the back of every piece. A honeycomb bed and $20 of pins fix all three at once.
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What the honeycomb actually does
Three jobs in one aluminum slab. Airflow: the open cells let smoke and heat escape below the cut instead of pooling in the kerf, which is worth a visible edge-quality improvement on plywood. Flashback control: cutting over a solid surface reflects the beam back onto the workpiece's underside, leaving burn blooms around every cut line — cells eliminate the reflection surface. Flatness: it gives warped stock something to be pinned flat against, and most kits include a steel base plate that catches fall-through parts and enables magnets.
For open-frame diode machines it also adds a fireproof floor over your table, which is reason enough on its own — see the safety checklist for the rest of that story.
Sizing and choosing one
Buy the honeycomb to your machine's working area, not its frame footprint — a 400 × 400 mm machine wants a ~400 × 400 mm comb (the common sizes: 300 × 200 for small CO2 machines, 400 × 400 and 500 × 500 for diode frames). Check the height: comb plus steel plate raises your stock 20–25 mm, which eats focus range on some diode modules; machines with short focus travel may need riser feet at the same time.
Cell size barely matters for hobby work (6–7 mm is standard). Thickness does: sub-10 mm combs sag over time; 12 mm+ stays flat. Steel base plate included is the feature to insist on — it's what your magnets grab.
The workholding kit
Honeycomb bed with steel base plate
The foundation: airflow, flashback control, and a fireproof work surface. Match your machine's working area and check total height against your focus range.
See options on Amazon →Laser hold-down pins (set)
Purpose-made plastic or aluminum pins that wedge into honeycomb cells and clamp stock edges flat. The four-for-$15 version of a solved problem — buy more than you think; big warped sheets want six to eight.
See options on Amazon →Small neodymium magnets with handles
Fastest hold-down for interior areas the pins can't reach (they grab the steel base plate through the comb). Keep them well clear of the cut path — they're tall enough to hit the laser head.
See options on Amazon →Non-slip sewing weights or steel bars
For engraving jobs where nothing gets cut through: weight beats clamping for speed, and flat steel bars stay under the head's travel height.
See options on Amazon →Masking tape, 2–3 in wide
Application tape on the top face prevents smoke staining on light woods and acrylic; on the bottom, it further reduces flashback marks on show faces. Cheap insurance on anything you'll sell.
See options on Amazon →Flattening warped stock, in escalating order
- Pin the high corners first, then work around the perimeter — most 3 mm ply flattens with four pins.
- For a stubborn crown in the middle, add magnets beside (never inside) the cut layout.
- Cut the sheet into smaller blanks first: a 300 mm square of warped ply fights you; four 150 mm squares lie flat.
- Flip the sheet so the crown points down — pins hold a dome's edges far better than a bowl's.
- If focus still varies more than ~1 mm across the job, the stock is beyond holding: buy flatter material — Baltic birch stays flat; big-box underlayment doesn't.
When you don't need one
Engraving-only work on flat, heavy stock (slate, glass, tumblers on a rotary) gains nothing from a comb — weight the piece and go. And CO2 machines with factory knife or honeycomb beds already solve this. The comb is specifically transformative for open-frame diode owners cutting sheet goods, which is most of the budget-laser crowd.
Frequently asked questions
Does a honeycomb bed really improve cut quality?
On through-cuts in plywood and acrylic, visibly: better under-cut airflow means less charring on the bottom half of the kerf, and no flashback blooms on the back face. On engraving it changes nothing — its value scales with how much cutting you do.
Why is the back of my plywood scorched around every cut?
Flashback: the beam passes through the kerf, hits whatever solid surface is below, and reflects heat back onto the underside. Cut over a honeycomb (or at minimum, prop the stock on standoffs) and mask the back face of show pieces.
Can I just use a metal grid or old oven rack instead?
Better than a solid table, worse than a comb: coarse grids leave reflection lines where the beam crosses bars, and nothing grips pins or magnets. As a free interim, prop stock on ~10 mm standoffs; buy the comb when cutting becomes routine.
Will the laser damage the honeycomb?
Slowly and cosmetically. Aluminum comb scatters the defocused post-kerf beam rather than absorbing it; expect surface discoloration over months, not failure. Keep the steel plate under it clean of debris — resin and tape scraps there are the actual fire risk.
Do magnets affect the laser or motors?
Not the beam at all, and the stepper motors don't care at hand-magnet scale. The real hazard is mechanical: a tall magnet inside the head's travel path gets hit at full speed. Place them, then jog the head through a dry frame run before firing.