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Design your curved lithophane with the options between and monitor what your design looks like with the image under "Your Design." Detailed instructions are at the bottom of the page.
For instructions, watch the video, read the blog post here, or read the below.
Default values are in the form above, so you can print right away, but you may want to change the design by changing those same values. The lithophane resolution determines the distance between unique thickness values, so a value of 0.3 would mean that there are 0.3mm between features on your lithophane image. A small Lithophane Resolution value will make your stl file a larger size, and will make your lithophane image clearer (assuming that you're 3D printer and original picture can match the resolution).
The Height value determines the height of the lithophane (including the frame). The Angle determines how curved your lithophane is. A small Angle will be flatter, while an Angle of 360 degrees will have a circular lithophane, perhaps to make a votive around a candle.
The size of the frame is controlled by the Frame Width, Frame Height, and Overhang Angle values. These values are shown in the schematic at the top. The Overhang Angle defines what the overhang will be as the lithophane transitions to the frame.
The maximum and minimum thickness determine the maximum and minimum thicknesses of the lithophane image, so these can be used to control the lithophane's brightness and contrast.