Eli5: Why do all my cups and glasses have rims on the bottom that collect water in the dishwasher?
In: Other
One easy explanation is production traditions, the molds used for making beaker are older than dishwasher.
No one thought about this Problem, even today a good amount of people still do t have a dishwasher, so not everyone get to knowtice this issue at all.
If you look at the McCafe cups in europe, you will see that McD had them made with an interrupted rim on the bottom so they still sit flush on a table but the water can easily rinse of.
The manufacturer normally just don’t care.
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