Lithopane filament calibration tool

Lithopanes are great fun on a 3D printer. However different filaments and filament colours allow different levels of light through and can compromise the available steps to produce the image unless the optimum maximum thickness, and step size is chosen.

This is a test piece to allow the thickness of filament used to produce lithophanes, such as the ones created by by Customizer http://www.thingiverse.com/apps/customizer/run?thing_id=74322, to be calibrated.

The calibration wheel has 30 0.1mm steps from 0.1 to 3mm thickness, this should be adequate for most filaments. Print with the filament you want to calibrate using 100% infill at 0.1mm z axis resolution. If 3mm is not enough simply scale in your slicer software.

When printed hold up to a typical light source for your lithopane and count the steps from the lowest up to where you cannot easily tell two steps apart. The last step number multiplied by 0.1 is now the thickness of filament you need for your black level (adjust f