3D Scanning vs Casting
A cast records an impression once, destructively, over a day — and if it cracks, the impression is already gone.
3D scanning records it in under a minute at 0.05 mm without touching it, so the impression is still there afterwards for anything else the case needs.
No sensitive case details required.
Should impressions be scanned or cast?
Scanned first, always: under a minute, contactless, 0.05 mm, and the impression survives. Cast afterwards only if the laboratory wants a physical exemplar — the scan has made that a choice rather than a necessity.
How they compare
Compared on what happens to the impression, and what you have afterwards.
| 3D scanning (Artec Spider II, Leo)Contactless optical capture of the impression in place. | Casting (dental stone, silicone)Physical negative poured or pressed into the impression. | |
|---|---|---|
| Time | Minutes, on site | A day for dental stone to set |
| Contact | None — nothing applied | Full — medium in the impression |
| Second attempt | Yes; the impression is intact | No; the impression is destroyed |
| Depth recorded | Yes, at 0.05 mm | Yes, once |
| Comparison | Digital overlay against a scanned shoe, tire or tool | Physical exemplar against a physical shoe |
| Choose this when | The first record, before anything touches the impression. | A physical exemplar, if the laboratory still wants one after scanning. |
Scanning does not prevent casting. It makes casting optional and moves it to second place.
Why the order matters more than the choice
Casting is a good method with a fatal property: it is a single attempt that destroys what it records. Dental stone takes a day to set in a footwear impression, release agents and medium go into the substrate, and a crack on lifting ends the evidence. Silicone for toolmarks is faster, and equally final.
Scanning has none of those properties. Artec Spider II records an impression in under a minute at up to 0.05 mm accuracy and 0.1 mm resolution with nothing applied; the documented Artec footwear case put that against 24-plus hours for casting. The impression is intact afterwards. Depth, wear and damage are geometry in the model, compared digitally against a scanned shoe, tire or tool.
That changes the question from scanning versus casting to scanning first, then casting if anyone still wants a physical exemplar. Many laboratories find they do not.
The figures behind the verdict
See an impression captured in under a minute, with nothing touching it — book a demo for your impression evidence.
Book a demoQuestions practitioners ask
Does scanning damage the impression?
No. Capture is optical and contactless; nothing is applied. The impression is available afterwards for casting or trace recovery.
Is a scan as detailed as a cast?
Spider II resolves 0.1 mm detail at 0.05 mm accuracy, which captures the wear and damage features identification relies on — and it holds colour as well, which a cast does not.
Can the scan be compared to a shoe or a tool?
Yes. The scanned exemplar is aligned to the scanned impression and measured in Artec Studio or in your comparison software after export.
Will courts accept a scan instead of a cast?
Units typically present the scan as the primary record and cast where a physical exemplar is wanted. Admissibility rests on method, as with any technical evidence.
Tell us about the work you do
A forensic application specialist will come back with the device that fits it, the accuracy to expect at that scale, and how the data reaches your existing workflow.