Grid from Active

Snaps every selected object onto a grid built from the active object: the active object's location is the grid origin and its bounding-box size is the cell size. Use it in Object Mode to line up modular kit pieces that are not 1 m cubes.

Hotkey: Not bound by default — assign a key in Preferences › iOps › Keymaps, or run it from operator search.

Tips

• Select the pieces to align, then make the reference piece active.
• The active object needs a real size on every axis you care about — a flat plane gives a degenerate grid on its thin axis.
• Rotation and non-uniform scale on the active object skew the grid; apply them first.