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I have a particle system that just doesn't want to stay still. I turned off all physics for it (including gravity) and removed all force fields, but they still move. Here's a gif of how they move: enter image description here

Frame 1: enter image description here

Frame 500: enter image description here

I've noticed that there's a pattern of movement: they appear to be separating on the Z axis. The only reason they're also moving left is because I put in a wind force field, but this unexpected effect still happened before the wind.

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It looks like your particles are getting a little normal velocity (i.e. being "pushed" off the emitter's surface). You need to turn down the Normal value under the Velocity rollout of the particle settings.

enter image description here

Set this value to 0.000 and your particles shouldn't move.

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