Check out first part of the tutorial here: https://ace5studios.com/spline-wrap-deformer-tutorial-part-1/
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more free tutorials: https://www.ace5studios.com/tutorials
The spline deformer lets you deform objects along a spline, it can also deform cloners and other things. In this tutorial i also tell you about the difference between cloning on a spline and deforming along a spline.