Planar curve with width I have a planar bezier curve, this curve is in general not closed but it can intersect itself.

What I want is to give this curve a finite width in the plane of the curve. I have found many ideas about giving a curve volume or extruding out of the plane of the curve but that's not what I need.

Is there a way to achieve a finite in-plane width (as if I was drawing the curve with a thick pencil) ?

Thanks!
If I understand correctly what you want, you can achieve this easily with bevel objects.

A Bevel Object defines a section to be swept or extruded along the curve object, if you want to add simple width to the curve object just create a simple linear bevel curve and use it as bevel object in your open curve.

Control the width of the 'ribbon' by controlling the size of the bevel curve