I would make a "paper" ipt. Make a path curve and then sweep a surface along the path. If the paper thickness is important, thicken the surface.
Constrain the paper ipt in your assembly as the first part. Then you can use it to locate the rollers in your machine. That way you can just edit the path currve and then the rollers will move to match.
Or locate the rollers, make the paper part adaptive and project the rollers into it. Then when you move the rollers, your path will update.
Steve Walton
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