If the carafe is not used overnight, should the lid be removed, the carafe dried and left open?
If the carafe is used again the next day, as is the case for almost all our customers, it is not strictly necessary to dry the lid and carafe.
There is no risk of germs forming overnight: a glass of water sometimes stands by the bed all night too.
Summer is different. In high temperatures it makes sense to put the filled carafe in the fridge, especially during weekend trips.
In summary:
1-2 days unused: simply leave it as it is, in summer put it in the fridge.
2-4 days unused: keep it filled with water in the fridge, or empty it and leave it to dry.
5 or more days unused: empty the water completely, remove the filter and store it in a bag in the fridge; rinse the carafe thoroughly and dry it.