Filament calibration

Print one small strip, read three numbers off it, and every lithophane you make afterwards is tuned to your filament and your light.

What this fixes

A lithophane turns brightness into thickness. Every maker on this site assumes that whole range is useful — but past a certain thickness your filament passes no useful light, so every darker tone comes out the same black; below a certain thickness it passes so much that every lighter tone comes out the same white. Where those limits fall depends on the filament, its colour and the lamp behind it. The site cannot know any of that, and no on-screen preview can show it.

Ten minutes and a few grams of filament turns that guess into a measurement.

1. Print the strip

The strip is an STL download, so it needs a free account.

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Calibrate your filament for lithophanes

Print one small stepped strip in the filament you use, hold it to the light you will use, and read off it where the detail runs out: the last step that is still washed out and the first that is already solid black. Save those numbers as a profile.

From then on the lithophane makers map your photo onto the thickness range your filament really shows detail in, so dark tones stop merging into black and light tones stop turning to plain white. It takes about ten minutes and a few grams of filament. The strip is an STL download, so it needs a free account.

Frequently asked questions

Why does my lithophane look muddy or washed out?

Past a certain thickness your filament passes no useful light, and below a certain thickness it passes too much. If the thickness range does not match your filament and lamp, detail is lost at one end or both. Calibrating fixes that.

How should I print the calibration strip?

In the filament you will use, at your usual lithophane layer height and line width, with 100 % infill.

Do I need a profile for every filament?

For every filament and colour you use for lithophanes, yes: white PLA from two brands can pass very different amounts of light.

Which light should I read the strip with?

The actual lamp or LED the finished lithophane will sit on, in a dim room.