FITD sells verified, not AI. This page says exactly what that word is doing — what gets measured, what the report claims, and what it deliberately does not.
The definition is the one in the Terms, and it is two things and no others:
That is the whole claim. "Verified" does not mean the part is fit for your particular application, that the material you choose is suitable, or that your print settings will produce a good result. Those judgements are yours to make.
Your description is read into a spec card — the dimensions, the features, the material, the process. You edit anything that is wrong and approve it. Nothing is generated and no credit is charged until you do, and the approved card is the list of numbers everything afterwards is checked against.
A CAD script is written from the approved spec and executed against a geometry kernel in a sandbox. If the script does not produce a closed, valid solid there is nothing to measure, and that is a failure at this step rather than a file you get handed.
The same kernel that built the solid measures it: the bounding box, the volume, and each dimension the spec stated. This is arithmetic on the solid, not an opinion about a picture of it, which is why it runs on every part on every tier.
Every stated dimension is listed with what you asked for beside what was measured. All inside tolerance is verified. One outside it is best effort, naming the axis. Nothing measurable to compare against is not verified — never a silent pass.
| verified | Closed, valid solid; every stated dimension inside tolerance. |
| verified after fix | The same, reached after an automatic correction — which is named in the report. |
| best effort | A closed solid, but at least one measured dimension is outside tolerance. The report says which. |
| not verified | Nothing could be measured, or the spec stated nothing to measure against. Not a pass. |
This is the report for the 30 mm control knob for a 6 mm D-shaft — the part the demo on the front page ends on — measured on 2026-09-22. Where it came from is set out below, because a worked example is worth nothing if you cannot tell what produced it.
| Dimension | Spec | Measured | Result |
|---|---|---|---|
| Knob diameter | 30.0 mm | 29.90 mm | Pass |
| Knob height | 18.0 mm | 18.0 mm | Pass |
| Shaft bore | 6.0 mm | 6.0 mm | Pass |
| Shaft flat | 5.50 mm | 5.50 mm | Pass |
Measured volume 10,811 mm³; thinnest wall 2.4 mm, against an FDM minimum of 1.2 mm. The diameter reads 29.90 rather than 30.00 because the knurl flutes cut fractionally into it — the report says what was measured, not what was hoped for.
The print-readiness checks that do run — minimum wall, smallest hole, unsupported overhang — are advisory. A check that errors is reported as "not checked", never as a pass.
Do not use generated parts in safety-critical applications — load-bearing structural parts, medical devices, aviation components, braking systems — without independent verification by a qualified professional. See the Terms.
This knob was modelled by hand with CadQuery 2.7 — the same geometry kernel FITD's pipeline generates against — from the script kept at scripts/demo/knob.py. It was not produced through FITD's own pipeline, which is why it is shown here, as an illustration of what a report says, and not on an /examples page, which is reserved for parts FITD generated.
The numbers follow the file, never the other way round: the kernel measured this STL at 29.90 × 29.90 × 18.00 mm and 10 811 mm³ (the knurl flutes take the outer diameter fractionally under 30). The 6 mm D-bore (5.5 mm across flats) is blind, 13 mm deep from the underside, leaving a solid top with the indicator slot — a through bore would show the shaft end on top of the knob, which no real knob does.
Not every part passes, and a page that only ever shows passes is a brochure. A real failed report — a genuine generation whose measured dimensions came back outside tolerance — will be published here, with the prompt, the spec and the measurements that did not match.
It is not here yet, and nothing has been mocked up in its place: an invented failure would be exactly the kind of made-up evidence this page exists to argue against. When the failure is generated, it goes up as it came out.
Separately from failing a measurement, some requests are refused outright rather than generated — Prohibited uses lists those categories and explains how warnings, suspension and appeals work, and the Terms set out what FITD does and does not warrant.