This is confusing. I'm going to state what I think I'm reading plus my own experience. 1.) It makes no difference when you change the Fidelity (after you've started, before you started, when you're done). Changing the fidelity will not be reflected in the modeling room but will change the model result in the assembly room, rendering, etc. 2.) If you're only putting "add" metaballs into the model, lower fidelity settings will work fine. If you need to use "subtract" metaballs, you will probably have to turn up the fidelity. -Kix

-Kix