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.