How to make a photo candle mold (a lithophane candle)
Drop a high-contrast photo into the photo candle mold generator. It wraps the picture around a candle as a lithophane relief (dark = thicker wax, bright = thinner), then builds a two-part mold you print in PLA. Cast pale, translucent wax below 85 °C, and when the candle is lit the flame backlights the wall and the photo appears. Rotate the image so the mold seam lands on the background, not a face.
What a lithophane candle is
A lithophane reveals an image through thickness: light passes through a thin translucent panel, and where the material is thicker less light gets through, so a photo appears in shades of light and dark. A lithophane candle wraps that idea around the candle wall. The flame inside becomes the light source, so once it's lit the picture glows through the wax.
The generator does the whole chain for you. It turns your photo into a watertight candle master (the positive, with the image embossed on the wall), then reuses the same two-part box-mold engine as the candle mold maker to carve a printable mold around it. Pour wax into the mold and every candle comes out with the picture in relief.
From photo to glowing candle in 5 steps
Upload and tune the photo
Drop in a high-contrast photo — a portrait, a pet or a bold silhouette. Use Contrast and Brightness to make the subject pop, and Invert if it's light on a dark background. Under Advanced, Max relief sets how thick the darkest areas get: more relief means more contrast when lit, but keep the bright areas at least ~0.8 mm so they still print.
Size the candle
Set the Diameter and Height. Height auto-fits your photo's aspect ratio when you upload, so the picture wraps all the way around without stretching — adjust either freely afterwards. A 70 mm pillar is a good first pour.
Rotate to place the seam
A two-part mold leaves a parting line, and the orange plane shows exactly where it falls — on the sides of the candle, with your subject centred on the front. Drag Rotate image so the seam sits on background or an unimportant area, never across a face. The faint line scrapes off after casting, but you don't want it splitting the picture.
Generate and print the mold
Hit Generate mold. The tool carves the two halves with a pour hole and downloads them as a 3MF. Print both flat-face-down on the same plate at 0.12–0.2 mm, 3 walls, no supports, in PLA. Dry-fit before pouring: the seam must close with no daylight through it. Want to sanity-check the picture first? Download the candle master, print it in translucent PLA and hold it to a light.
Cast wax and light it
Thread the wick through the pour hole and centre it on a pencil. Clamp the halves with rubber bands and pour pale, translucent wax below ~85 °C so the PLA doesn't soften. Cool several hours at room temperature, open the seam and lift the candle out. Then light it: the flame backlights the wall, thin areas glow and thick areas stay dark, and the photo appears.
Know the limits: detail, wax and heat
- Detail is softer than a flat lithophane. The picture has to survive the print, the mold and the wax pour, and the wall is only a few millimetres, so fine detail rounds off. High-contrast faces and simple scenes read best; busy, low-contrast photos don't.
- Wax must be translucent. Pale paraffin or soy glows well; heavy dye or opaque wax blocks the effect. Test with undyed wax first.
- Heat: PLA softens above ~85 °C — keep the wax cooler, or print the mold in PETG/HTPLA for hotter pours.
- Seam: the parting line always lands on the sides. Rotate the image so it misses the subject; see the draft angles guide for why a two-part mold splits where it does.
New to pouring? The candle-making walkthrough covers wax types, wick sizing and pour temperatures in depth. Prefer a flat panel instead of a candle? Try the photo lithophane generator.
Photo candle mold FAQ
What photos work best for a lithophane candle?
High-contrast shots with a clear subject and a plain background: portraits, pets and bold silhouettes. The wall is only a few millimetres thick, so fine detail is softer than a flat printed lithophane. Faces and simple scenes read far better than busy, low-contrast photos.
Does the picture show when the candle isn't lit?
Only faintly, as a subtle relief on the surface. The effect comes alive when the candle is lit: the flame backlights the wax wall, thin areas glow bright and thick areas stay dark, so the photo appears in light. It's the same physics as a backlit lithophane, wrapped around the candle.
What wax should I use so the picture glows?
Use a pale, translucent wax — paraffin or a soy blend — and skip heavy dyes. Colour and opacity block the light that makes the image appear. A little white or a light tint is fine; a dense colour will hide the effect.
Where does the mold seam end up on the image?
A two-part mold always leaves a parting line, here on the two sides of the candle. The generator shows it as an orange plane and centres your subject on the front, off the seam. Use the Rotate image slider to move the seam onto background or an unimportant area, never across a face.
Can I just 3D print the candle instead of casting it?
You can print the master (the positive) in translucent PLA and backlight it to preview the effect, but that gives you one object per print. A mold lets you cast the shape in real wax, again and again, and a lit wax candle glows far better than a solid print. Print the master to test, cast wax to keep.
Made by @meshminds3d. Got stuck? Email a photo and I'll help you debug.