Filter tip for pocket-type(trapezoid) brewer

In many pocket-type(trapezoid) brewers, when the paper filter fits too well, the flow is blocked and the flow is difficult. (It's separate matter from choking by fines in the later half of extraction.)
If you fold filter twice as widw and 'the support of the coner is shaped', a space between the hole and the surface of filter can be made to prevent choking.
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