Imported SVG Is the Wrong Size? Verify One Reference Square Before a Large Cut
Add one known-dimension square before trusting an imported large file. Compare the source application's units, SVG or DXF import result, and no-output bounding box before material enters the workspace.
A 3.779 scale error can point to a unit mismatch
The 2026 LightBurn thread provides the concrete problem behind this workflow. A March 2026 LightBurn case reports SVG and DXF import differences and a 3.779 scale mismatch consistent with a unit-conversion problem.
Catch the wrong envelope at frame time
A 100 mm square that imports near 26.46 mm suggests a 3.779 conversion relationship. Units are one candidate; export metadata, source-app behavior, and import assumptions still need comparison before any cause is accepted.
Build the reference-square audit
| Checkpoint | Expected evidence | If it differs |
|---|---|---|
| source square | 100 × 100 mm in source app | fix document units |
| SVG import | same measured square | review SVG unit/export settings |
| DXF import | same square and chosen units | review DXF unit assumption |
| job envelope | fits intended board and machine state | stop before output |
Compare SVG and DXF without cutting
- Record the source application's document unit and exported format.
- Include a reference square outside the finished artwork or in a non-output inspection layer.
- Measure the imported square numerically; visual fit-to-screen is not evidence.
- Frame the full bounding box without output on the intended machine configuration and eligible material support.
X1S 2026 size facts and file limits
X1S 2026's listed work area cannot correct a source-file unit mismatch. The reference-square and bounding-box checks must pass before the large physical envelope is trusted. Compare the verified square with the work-area facts on the X1S 2026 page before trusting the envelope.
Once scale is verified, preserve operation roles with the layered-map order guide; use the corner-fit ladder when correct dimensions still assemble poorly.
Imported-scale questions
Can I simply scale until the overall width looks right?
That may hide a unit error and distort future edits. Verify a known dimension.
Is SVG always more reliable than DXF?
Either can work when source and import units are controlled. Compare measured results.
Does correct size prove the material fits?
No. File scale, physical support, work area, material eligibility, and safe operation are separate gates.