Laser-Cut Puzzle Pieces Too Loose at Corners? Test Kerf Through Turns
A straight kerf coupon is not enough for puzzle pieces. Include inside corners, outside corners, and direction changes, then judge rotation and assembly after the planned finish.
Puzzle fit changes through a turn
Demand evidence comes from a 2026 LightBurn thread: a January 2026 kerf discussion shows that successful fit values can differ from claimed spot size and can vary by direction and geometry.
Measure assembly, not beam claims
- Use identified laser-compatible material from the production lot and preserve grain direction.
- Create bounded candidates with active supervision, effective exhaust, fire readiness, and immediate stopping for flame, persistent smoke, abnormal heat, or deformation.
- Assemble only after cooling and the planned cleaning or finish allowance.
- Select the fit from accepted handling behavior, not from a claimed spot-size number.
Design a corner-aware fit ladder
| Pair | Geometry | Measured behavior | Release note |
|---|---|---|---|
| S | straight tab and slot | force and play | baseline |
| I | inside 90° corner | corner interference | dog-bone or clearance decision |
| O | outside turn | visible gap | edge decision |
| G | grain rotated 90° | breakage/play | material-direction decision |
Two corners with the same nominal clearance
A straight tab can slide at one offset while the same nominal clearance binds at an inside corner. The turn concentrates geometry and finish buildup differently, so the puzzle needs a corner specimen.
Check the source dimension first with the SVG reference square. For a smaller first-sheet version of the same fit question, see the A1 Mini kit strip.
X1S 2026 boundaries for puzzle layouts
The 800 × 800 mm starting configuration and expansion path provide layout options, but puzzle fit still belongs to the actual eligible sheet, grain, geometry, focus, finish, and supervised proof. Use the X1S 2026 work-area information for layout planning, then let the physical ladder decide fit.
Puzzle-fit questions
Should kerf offset equal the advertised laser spot?
No. Real fit includes material, focus, direction, geometry, finish, and process effects.
Can one ladder cover every plywood lot?
Recheck when material, thickness, lot, finish, or setup changes.
What if the tightest fit breaks during assembly?
It fails the use case even if its measured gap looked precise.
