How to make a lithophane from a photo

A lithophane is a thin 3D-printed panel that looks like a plain frosted plate until you shine light through it — then a photo appears. To make one, you upload a photo, the generator turns brightness into thickness (dark areas print thicker to block more light, bright areas thinner to let it through), and you print it in white PLA. Here's the whole process, from choosing a photo to lighting the finished piece.

How a lithophane works

The magic is thickness. Where the photo is dark, the plate is thicker and blocks more light; where it's bright, the plate is thinner and lets more light through. In normal room light you mostly see a white relief; backlit, those thickness differences become shades of gray and the image resolves. That's why lithophanes are printed in white or light filament — the material has to transmit light evenly.

Choose a good photo

The photo does most of the work. Pick one that is:

• High contrast with a clear subject — faces, pets, and landscapes translate beautifully.
• Not too busy — fine background clutter turns to mush at plate scale.
• Well lit, with the subject standing out from the background.

A bright subject on a dark background can be flipped with the Invert (negative) option so it reads correctly as a lithophane.

Make it in the generator

Open the lithophane generator and drop in your photo — it's processed in your browser and never uploaded. Then tune:

• Detail (Fast / Balanced / Fine) — the grid resolution across the width. Higher looks sharper but makes a heavier model; Balanced is a good start.
• Contrast — spreads light and dark further apart, deepening the difference between thin and thick areas.
• Brightness — shifts the whole image thinner (lighter) or thicker (darker).
• Width — the overall size; height follows your photo's proportions.
• Max thickness (dark) and Min thickness (light) — the thickest and thinnest points of the plate. The minimum is kept thick enough to print solidly and still pass light.
• Frame — an optional raised border.

Switch the preview from Relief (the surface texture) to Backlit to see how it'll look lit before you commit, then export STL for any slicer or 3MF for Bambu Studio.

Print settings

Lithophanes reward a slow, fine print:

• Filament: white or light PLA. Every filament has a slightly different sweet spot, so a quick test print pays off.
• Layer height: fine — around 0.1 mm captures smooth gradients; 0.2 mm is the coarse end where quality starts to suffer.
• Infill: effectively solid (near 100%) so light passes through cleanly with no pattern showing.
• Speed: slow. Lithophanes look noticeably better printed gently.

One handy detail: the generator already mirrors the model and expects you to light the textured (relief) side and view the smooth side — so print it as-is, don't flip it.

Flat or upright?

You can print a lithophane flat on the bed or standing upright, and it's a real trade-off:

• Upright (vertical): generally the sharper choice, because a printer's resolution across the X/Y plane is finer than along the Z axis — so the image detail comes out crisper. It's slower and may need a brim or small supports for stability.
• Flat: simpler and support-free, but the image's vertical detail is limited by layer height, and layer lines read across the picture.

For a display piece where detail matters, upright is usually worth the extra effort.

Backlighting your lithophane

A lithophane is only as good as its light. Use an even, diffuse source behind it — an LED panel, a lightbox, a phone screen on white, or a bright window. Avoid a single harsh point light, which creates hot spots. LED strips or panels run cool, which suits PLA; warm-white light gives a cozy look, cool-white a crisper one. Many makers build a small stand or frame with the light tucked behind the plate.

Troubleshooting

• Too dark overall: raise Brightness or lower Max thickness so more light gets through.
• Washed out / flat: increase Contrast, or pick a photo with more tonal range.
• Detail looks mushy: raise the Detail setting, print finer/slower, or try upright orientation.
• Layer lines dominate the image: drop the layer height and slow the print.

FAQ

What filament should I use?

White or light-colored PLA. The plate needs to transmit light evenly, and light material shows the tonal range best. Test-print a small sample to find your filament's sweet spot.

Flat or vertical?

Vertical usually gives sharper detail because printers resolve finer in X/Y than in Z. Flat is simpler and support-free but shows layer lines across the image.

Why is my lithophane too dark?

Raise the Brightness, reduce the Max thickness, and make sure your backlight is bright and even. A higher-contrast photo also helps.