The best way to test the transparency is with a 35mm slide. You can look at it in the light or you could even use it in your old slides projector.
Generated for the most common materials, I'll try to keep updated. I take the list from Seemomster. I also add a blank sample. Feel free to message me if I miss something.
Size: 50.8x50.8x2.0 mm, use 4.87g or 1.63m of filament

Boxes are generated with this model.
08.10.2023 - Add HYPER PLA
01.10.2023 - Add Rugged Boxes for Prusa Mini
12.08.2023 - Add Rugged Boxes from Whity
12.07.2023 - Add PLA CF
03.05.2023 - Add GLASSBEND
27.03.2023 - Add EVA and PCTPE
11.03.2023 - Add FLEX PLA
11.10.2022 - Add PETG CF
01.10.2022 - Add PLA PRO and PC CF
26.09.2022 - Add PCTG sample
06.09.2022 - Update boxes to version 1.3
The author marked this model as their own original creation.