A fluid ejection device includes a chamber, a first fluid channel and a
second fluid channel each communicated with the chamber, a first
peninsula extended along the first fluid channel and a second peninsula
extended along the second fluid channel, and a first sidewall extended
between the first peninsula and the chamber, and a second sidewall
extended between the second peninsula and the chamber. The first sidewall
is oriented at a first angle to the chamber and the second sidewall is
oriented at a second angle to the chamber such that the second angle is
different from the first angle.