Mesh issue count
No core V1 mesh issue found in this sample.
0 criticalsafe
STL dimensions and size
Check STL size, dimensions, and triangle count in one report.
Use the current mesh analysis to inspect bounding box size, triangle count, format, and repair risk before sending a model to a slicer.
Bounding box dimensions
Triangle count and format
Mesh health with size context
Safe repair means conservative mesh cleanup. Holes, non-manifold geometry, and printability still need review when the report says they are beta or report-only.
stl size checker
Upload an STL to check dimensions
The checker parses your STL and reports bounding box size, triangle count, format, and issue families from the same workflow.
Anonymous checker limit: 10MB or 100,000 triangles. Checks run locally in your browser for V1.
What gets checked
5 issue families
Repair stance
Safe fixes first
Engine
0.1.0-checker-first
Sample preview
Sample STL size report
The model has a clean mesh signal, but the bounding box tells you whether scale looks plausible before slicing.
Print-ready score
93 / 100
Sample file
miniature-base.stl
Bounding box
28.0 × 28.0 × 3.2
Triangles
12,944
Format
binary STL
Scale review
Units are not stored in STL, so final unit choice stays manual.
manualreport only
This is an illustrative sample report, not a real user upload or a guaranteed repair result. Run the checker on your own STL before printing.
Intent focus
Dimensions without inventing unsupported features
This page uses the existing bounding box and triangle-count analysis. It does not add unit conversion or slicer simulation.
Check whether bounding box dimensions look plausible.
Use triangle count to spot unusually heavy files.
Pair size review with mesh health before print setup.
Repair boundary
What the size checker can and cannot know
STL files do not store real-world units. The checker reports numeric bounding box dimensions, while unit interpretation stays with the user.
Supported in the current tool
Bounding box size from parsed vertices
Triangle count and STL format
Mesh issue report in the same workflow
Kept explicit or report-only
Millimeter vs inch auto-detection
Wall thickness simulation
Printer build-volume guarantee
FAQ
Questions about stl size checker
Can this check STL dimensions?
Yes. It reports the bounding box size from parsed STL vertices along with triangle count and mesh issue data.
Does STL store units like millimeters or inches?
No. STL stores coordinates but not units, so the checker reports dimensions without guessing the intended unit system.
Can triangle count affect printing?
Very high triangle counts can slow slicers or indicate noisy exports. The checker reports the count so you can review it early.
Related STL tools
Continue with a related STL workflow
These pages reuse the same checker, but each one explains a different STL repair intent.