Make all objects on an array fit exactly on a curve I created cube, then I created circle-curve and scaled it. Then I set modifers on the cube: array to fit the curve length, and next a curve modifier. But my cubes not fit exactly on the curve, and I don't know why :-/ If someone finds a solution to this problem, please share it.

I attached screenshots of my steps.
Fit Curve changes the number of copies in the array to fit within the length of the curve object specified in Curve.  If the length of your mesh is a multiple of the length of the curve, then there will be an exact fit.  It is up to you to scale your mesh.