One photograph gives you a front surface; everything else is inferred. Here is how to prepare the image, print the figure, and stay inside the rules.
Convert an image to STLYou have a photograph of someone and you want a photo to 3D figurine you can actually hold. The image is a flat projection. It records brightness and colour, not depth. A converter has to guess how far the nose sits from the ear, how deep the eye sockets go, how far the chin projects past the neck. Those guesses hold up on a clean, front-facing, evenly lit portrait. They fall apart on almost everything else. The mesh looks right from the camera angle and thin or lumpy from the side.
The first failure is usually the source photograph, not the converter. A phone flash drops a hard shadow under the nose, which becomes a ridge in the mesh. Hair against a busy background turns into a ragged fringe. Sunglasses, a hand near the face, or one person standing behind another leaves a region the tool has to invent. Crop tight to head and shoulders, remove the background, and shoot in diffuse daylight before you convert anything. Ten minutes of prep saves an hour of mesh repair.
Then there is everything the camera never saw. The back of the head, the far arm, the gap between torso and sleeve. A converter can mirror and smooth those regions, which gives you a mannequin rather than a person. If likeness matters, plan to clean the mesh afterwards: close holes, thicken walls under 1 mm, and check the model in a slicer before you commit filament or resin. The print will read as the person from the front and three-quarter angles, which is enough for most shelf figures.
Pick the workflow that matches how much of the person has to be recognisable in the finished print.
Crop to head and shoulders, remove the background, convert, then print at 60 to 100 mm in resin at 0.05 mm layers. This workflow holds a likeness best, because the face is the one thing the photograph genuinely describes.
Use a photo where the arms are clear of the torso and the legs are separated. Expect the back and the far side to be invented by the converter. Fix the silhouette in a mesh editor before slicing; only the front will carry the print.
If you only need a recognisable outline, convert the shape into a relief and print it on FDM. A 0.4 mm nozzle holds a flat plaque far better than it holds a nose, and it needs no supports.
Rough figures for one copy printed at home, on the machine named, with a base included.
| Output | Typical size | Print time | Notes |
|---|---|---|---|
| Head and shoulders bust | 60 to 100 mm tall | 3 to 5 hours, resin | Faces need 0.05 mm layers |
| Full-body figure, front-facing | 75 to 150 mm tall | 5 to 9 hours, resin | Back of head is inferred |
| FDM silhouette plaque | 100 to 200 mm tall | 2 to 4 hours at 0.2 mm | 0.4 mm nozzle erases detail under 0.5 mm |
| Pet figure from one photo | 50 to 120 mm tall | 4 to 8 hours, resin | Fur reads as noise, so smooth it |
Add support removal, washing and UV curing to any resin figure, which is another 20 to 40 minutes of hands-on work. FDM skips all of that, but it will not resolve an eyelid or a fingernail at any size.
If the face is not yours, get permission before you convert and print it. Photographs of people carry rights, and a printed figure of a colleague, a customer or a stranger is a different thing from a photo on your phone. Ask before you upload. That applies to public figures and to photographs you found online. If you want to paint and sell figures of other people, get written permission and be clear about what you will do with the files.
Think about what the upload contains, too. A photograph of a child, a home interior, a licence plate in the background. The converter accepts JPG, PNG, GIF, BMP, TIFF, WebP, SVG and HEIC up to 20 MB, and uploaded files are cleared from the cache after processing. That is the honest description: no audit trail, no certification, just a file that does not stay. Crop out anything you would not hand to a stranger.
Match the print to what the mesh can carry. STL stores geometry only, so there is no colour and no texture in the file; paint the figure afterwards. On resin, layer heights of 0.03 to 0.05 mm hold an eyelid, a collar edge, a small nose. On FDM at 0.2 mm layers with a 0.4 mm nozzle, anything thinner than the nozzle width is rounded off or lost. Add a base: a 100 mm figure standing on two feet will not stay upright.
Upload the image, set the height and base options, and download the STL. It runs in the browser on Windows, macOS, Linux, iOS and Android, with nothing to install and no account needed for a basic conversion.
Crop the photo to the person, remove the background, and convert it into an STL. Open that file in a slicer, check for holes and thin walls, and print it in resin at fine layers if the face matters. One photo gives you a reliable front surface; the back and sides are generated, so expect to repair them.
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