From time to time i like to print a litophan... The problem i encountered is that not all filament is suitable. Or not in the same thickness.

So i made this little test to see how "transparant" my filament is.

The first disc goes from 0.1mm in the center to 1 mm at the edge.... The other discs are 1,2 and 3 mm Ok 3mm is very hopefull, until now i was already pleased if the 2mm worked.

In this way you could even check up to 7 mm.

I used it on 2 pla filaments already, on went up to 1.3 mm before the light was blocked... the other one i got to about 2.2 mm (useful for litophane)

The thicker you could go, the better for a litophane, you get more fluent chading.

One tip.... always use 100% infill or the results are not correct.