This is a model for checking how the layer looks like under different angles. The test contains 18 slopes in angles ranging from 5 to 85 degrees. To really have a benefit from this test, print the model in various layer heights, or using different materials.

I also made a case to store and organize these tests. There are two versions for 3 and 6 items. More here: https://www.thingiverse.com/thing:3600221

I will appreciate the feedback, so feel free to share your experience in the comments.

Update (2019-05-16): Slightly changed the size from 67.6mm to 68mm and from 80.6mm to 80mm.