I work with electrical conduits and it would be handy to have a smartline which will draw the circular bends at specific angles. For example the bend could have an angle of 11.25, 15, 22.5, 30 or 45 degrees. You could also nominate bend radii such as 300, 450, 600, 900, 1200mm and so on. Ideally a library of manufacturers parts would be the best solution. You would then be able to select what particular diameter conduit you would like to use and then it would automatically control the snap angles and you could also nominate the minimum bend radius. With this in place you can be assured that the bend radius is a real bend that can be purchased and not some random bend just drawn in for appearances.