Millimeter Grid Setting, Lose Grid with Camera Movement

Greetings. I'm working in mostly millimeters for 3D printing. When I scale the grid to mm and zoom into the grid, manipulation of the camera still seems scaled to meters. I completely lose the grid with the most minor movement. Is there a setting to have the camera adjust to mm increments as well? Hoping I'm giving a clear picture of what's happening with proper terminology. Thanks for any help.

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