They don't include those measuring cups for washing powder anymore so, I made one to print.

Challenge

Getting the volume perfectly right. It clearly can be done so I had to do it.

Here's what's going on

Parameters of the OpenSCAD file are in bold.

The nice thing is: You decide on a bucket size in ml (milliliters). a bucket is one ring on the cup. So, if the bucket size is 25ml and the amount of buckets is 4 you get a cup with a total volume of 100ml and a ring every 25ml.

Then you choose a fitting diameter so it looks nice and the size of the chamfer but 1 is usually good in most cases.

Lastly the height of the bottom shell in mm and the thickness of the wall.

Wall thickness if required for Prusa Slicer because it only puts the perimeters completely inside the model. Use half the wall thickness if your slicer puts the perimeter exactly on the edge of the model. If your slicer is able to use vase mode to touch the model from the outside, set it to 0.

Why all this?

The volume of every bucket is defined as well as the diameter and the chamfer. The height is calculated precisely taking into account the reduction of the volume by the rings.

Looks

Using a clear filament really shines in vase mode.

Printing

Use vase mode and accept the settings it wants to apply. The print will not be waterproof unless specially treated.