Why do some coffee makers require the carafe to make contact with the tray for the coffee to drip?
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This is an anti-drip feature. The carafe is placed on a heating plate to make sure the coffee keep warm. But if you remove the carafe while there is still a tiny bit of liquid going through the filter the last drops of coffee will drop down on the hot plate making a foul burning smell. To prevent this some coffee makers add an anti-drip feature which shuts off the flow of coffee through the filter when you remove the carafe. Some are automatic and will only be open when the carafe push it out of the way and some are manual allowing you to better control the speed of the extraction. However make sure to clean the anti-drip system regularly as it often gets pieces of dried coffee in it preventing it from sealing. So a dirty coffee maker may drip even with an anti-drip feature.
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