This feature is mostly just for fun. But if you've ever wanted to make your BikeCAD drawing look a little more organic, a little more hand-drawn. You can go to the bottom of the Paint dialog box and select the Squiggly checkbox. This changes the outline from smooth lines and arcs to an erratic path. You can adjust the path with the X value which specifies the average distance between points which deviate from the true path. Here's what happens when we go from 6mm to 22mm and then down to 2mm and back up to 6mm. The Y value specifies how far on average these deviating points stray from the true path. Here, we have Y going from 2 to 8 and then down to 0. Setting X and Y to zero negates the whole effect, but if that's your goal, simply uncheck the Squiggly checkbox. Note that as you experiment with this effect, you may also like to change the thickness of the outline which is also controlled in this section. Here, the outline has been changed from 1 to 4mm.