How to 3D Print Lithophanes: The Complete Beginner's Guide

A lithophane is one of the most impressive things you can make with a 3D printer. Hold it up to a window or place it on a lamp base, and a hidden image appears — a portrait, a landscape, a cherished memory — rendered in delicate shades of light and shadow through varying thicknesses of white plastic.

Unlike a printed photograph, a lithophane has physical depth. The thinnest parts let the most light through and appear brightest, while thicker areas block light and create shadows. The result is a tactile, luminous image that feels almost magical the first time you see it.

The best part? You do not need a specialised printer or expensive materials. Any FDM printer that can print PLA — which is essentially all of them — can produce stunning lithophanes. This guide walks you through every step, from choosing the right photo to dialling in your slicer settings for perfect results.

What Exactly Is a Lithophane?

The concept dates back to the 1820s, long before 3D printing existed. Original lithophanes were made by carving images into thin sheets of porcelain. When held to the light, the varying thickness of the porcelain created a photographic effect. The word itself comes from Greek — lithos (stone) and phainein (to show).

Modern 3D printed lithophanes work on exactly the same principle. Instead of carving porcelain, you convert a digital image into a variable-thickness 3D model. The brighter parts of the image become thinner sections of plastic, and darker parts become thicker sections. When backlit, the light shines through brightly where the plastic is thin and dimly where it is thick, reproducing the original image in tones of light and shadow.

What You Will Need

• A 3D printer. Any FDM printer that prints PLA will work. Printers with a heated bed make things easier but are not strictly required.
• White PLA filament. Natural white or pure white PLA gives the best light transmission. Avoid off-white, cream, or silk PLA, which can dull the image.
• A photo with good contrast. Portraits, landscapes, and high-contrast black-and-white images produce the best results.
• An image-to-STL converter. A tool like ImageToSTL converts your photo into a printable 3D model.
• A slicer. Cura, PrusaSlicer, or any slicer that lets you set variable layer height and print settings.
• A light source. A window, a lamp, an LED base, or even a phone flashlight works for viewing your finished lithophane.

Choosing the Right Photo

The quality of your lithophane depends heavily on the photo you start with. Here is what makes a good candidate:

Ideal Photos

• Portraits with clear facial features. A well-lit headshot with distinct shadows translates beautifully. Eyes, nose, and mouth contours create natural depth in the lithophane.
• High-contrast black-and-white images. These produce the most dramatic results because the tonal range is already optimised for light transmission.
• Landscapes with distinct layers. A mountain range against a bright sky, a city skyline at sunset — scenes with clear separation between light and dark areas work well.
• Simple compositions. A single subject centred in the frame is easier to process and usually looks better than a busy group shot.

Photos to Avoid

• Very dark images where most pixels are in shadow — there is not enough brightness variation to work with.
• Heavily compressed JPEGs with visible block artefacts — these show up as surface noise in the final print.
• Images with large areas of solid white — these will be paper-thin and fragile, or collapse entirely.

Preparing the Image

A little image preparation goes a long way. You do not need advanced editing skills — most adjustments can be done in any free photo editor.

1. Crop to your subject. Remove unnecessary background so your subject fills the frame. The converter maps the whole image area, so empty space is wasted.
2. Convert to grayscale. Lithophanes use brightness only. Converting to grayscale beforehand lets you see exactly how the converter will interpret your image.
3. Boost contrast. Increase the contrast so the darkest areas are near-black and the brightest areas are near-white. A wide tonal range produces a lithophane with better depth.
4. Adjust brightness. The overall image should lean slightly bright. If your photo is too dark, the lithophane will be thick everywhere and the image will be hard to see when backlit.
5. Apply subtle sharpening. A small amount of sharpening helps preserve edge detail that might otherwise blur during conversion.

Converting the Image to a Lithophane Model

With your image prepared, head to the free converter at ImageToSTL. The process is straightforward, but the settings matter for lithophanes specifically:

1. Upload your image. Drag and drop your prepared photo. PNG is preferred for quality.
2. Set Max Height to 2–4mm. This is critical. Lithophanes need to be thin so light can pass through. A max height of 3mm is a great starting point. Going above 5mm will make the image too dark to see.
3. Enable Invert Height. This flips the mapping so bright pixels become thin (letting light through) rather than tall. This is the single most important setting for lithophanes.
4. Disable Add Base. A base adds thickness that blocks light. Lithophanes should have no base. The model is printed directly on the print bed.
5. Set Smoothing to 2–3. Some smoothing softens pixel transitions and gives the lithophane a more polished look. Too much smoothing will blur fine details.
6. Remove Background. Enable this if your image has transparency to ensure clean edges.
7. Click Convert. The 3D preview will show a surface that looks almost flat — that is correct. The height variations are subtle because the total range is only a few millimetres.
8. Download the STL file.

Slicer Settings for Lithophanes

Getting the slicer settings right is just as important as the model itself. These are the settings that produce consistently good results:

Layer Height

Use 0.12mm or 0.16mm. A finer layer height captures the subtle thickness variations in the lithophane much better than 0.2mm or 0.28mm. The difference in quality is dramatic.

Orientation

Print the lithophane standing vertically on its edge, not flat on its face. This means the print moves across the width of the image rather than building it up layer by layer. Vertical orientation produces much sharper detail because the nozzle traces the contours of the image directly. Most lithophane STLs are already orientated correctly, but double-check in your slicer.

Infill

Set infill to 100%. Any gaps inside the lithophane will create uneven light spots and ruin the image. The model should be completely solid. If you are concerned about print time, note that a 100% infill lithophane is still relatively fast because the model is thin.

Wall Count

Set wall count to 2–3. The outer walls form the surface of the lithophane and need to be smooth. Too few walls and the infill pattern may show through.

Bed Adhesion

Use a brim (5–10mm) rather than a raft or skirt. The brim keeps the tall, thin model from tipping over during printing and is easy to remove afterwards.

Nozzle Temperature

Print at the lower end of your PLA's recommended range, typically 190–200°C. Lower temperatures reduce stringing and give better detail on small features.

Print Speed

Slow down. 40–50mm/s is a good range for lithophanes. The slower speed gives the plastic more time to cool and set, which improves detail quality. Some slicers let you set a lower speed for outer walls — use 30mm/s if available.

Quick Reference Settings Card

Common Lithophane Problems and Fixes

The image is too dark / hard to see

The lithophane is too thick overall. Decrease the Max Height in the converter or check that your slicer is set to 100% infill. Also make sure you are using a bright enough light source — a phone flashlight is much brighter than ambient room light.

The image looks like a negative (dark areas are bright)

You forgot to enable Invert Height during conversion. Without inversion, the converter treats bright pixels as tall (thick) instead of thin. Re-convert the image with Invert Height turned on.

The print has horizontal banding across the image

This is usually caused by Z-axis binding or inconsistent layer cooling. Check that your Z-axis leadscrew is clean and lubricated. Enable "adaptive layer height" in your slicer if available, which smooths out transitions between layers.

Strings or blobs on the surface

Retraction settings need tuning. Increase retraction distance by 0.5–1mm and enable "wipe while retracting" if your slicer supports it. Lower the nozzle temperature by 5°C to reduce oozing.

The print fell over during printing

Increase the brim width to 10–15mm. Make sure your build plate is clean. A thin layer of glue stick on the bed can improve adhesion for tall, narrow prints.

Displaying Your Lithophane

A lithophane needs backlighting to reveal its image. Here are a few popular display options:

• Window display. The simplest option. Tape or stand the lithophane in a windowsill. Daylight provides beautiful, even backlighting.
• LED lamp base. 3D printable lithophane lamp bases are widely available on Thingiverse and Printables. They hold an LED strip and the lithophane slides into a slot on top.
• Desktop stand. A simple angled stand with a USB-powered LED panel behind it. Compact enough for an office desk.
• Nightlight. Small lithophanes can be placed in front of a low-wattage bulb to create a soft, personalised nightlight.
• Keychain. Tiny lithophanes with a hole for a keyring are popular gifts. Keep the size under 40mm and the max height under 2mm for these.

Frequently Asked Questions

Final Thoughts

Lithophanes are one of those rare 3D printing projects that consistently impress everyone who sees them. A wedding photo becomes a luminous keepsake. A pet portrait turns into a glowing nightlight. A favourite landscape hangs in a window and changes with the daylight.

The process is remarkably accessible. You need a standard printer, a spool of white PLA, and a free browser-based converter. The first one you make might have a few rough edges, but the second will already be noticeably better. By the third, you will be experimenting with sizes, shapes, and display ideas.

The most common reaction when someone sees a lithophane for the first time is a pause, followed by: "Wait — that came out of a 3D printer?" That reaction never gets old.