Print Readiness
Checker
Find out whether a part will actually print before you spend hours finding out the hard way. The checker measures wall thickness across the surface and flags every overhang that needs support, judged against your own printer's limits.
Free for files up to 25 MB, no signup. Files are deleted automatically within 24 hours.
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What It Checks
A slicer tells you a file is broken. This tells you whether the part itself can be made, in this orientation, at your printer's limits.
Wall thickness
Surface points are sampled and a ray is cast straight into the solid from each. The nearest opposite wall is the local thickness. Regions below your minimum are flagged.
Overhangs
Every face is compared against the build direction. Downward faces steeper than your support angle cannot print without support material.
Your thresholds, not ours
Minimum thickness depends on your process, nozzle, and material. A 0.4 mm FDM nozzle and an SLA resin printer disagree, so both limits are inputs.
A report you can keep
The result is a plain-text report: thinnest sampled wall, share of surface below minimum, unsupported area, steepest overhang, and a verdict.
Thin regions marked in 3D
After the analysis, the sampled points that fall below your minimum are drawn in red on the 3D preview, so you see where the problem is, not just that one exists.
Nothing is modified
This is analysis only. Your mesh is read, measured, and left alone. Pair it with the repair tool if defects turn up.
STL and OBJ input
Upload either. Works best on a watertight solid; the report says so when the mesh is too broken to measure reliably.
How It Works
Measure
The mesh is loaded and measured: triangle count, bounding box, surface area, enclosed volume, and whether it is a closed solid.
Analyse
The overhang pass compares every face against the build direction. The thickness pass samples the surface and ray-casts into the solid to find the opposite wall at each point.
Report
You get the thinnest sampled wall, how much of the surface is below your minimum, the unsupported area, the steepest overhang, and a plain verdict.
What this checker is not
It is not a slicer. It does not simulate toolpaths, bridging, cooling, or material behaviour. A part can pass every check here and still fail for reasons a geometric analysis cannot see, like warping on a large flat base.
The thickness numbers come from sampling, up to 1,500 points across the surface. A feature smaller than the sample spacing can slip through. Treat a clean result as strong evidence, not proof.
And it assumes the mesh is sound. Holes and non-manifold edges make ray distances unreliable, so if the report flags the mesh as broken, run it through the STL Checker & Repair tool first and check again.