Replacement part for my Peugeot 205's heating control: Air flow, fan speed and temperature. These knobs snug on a little pivot with a flat side. The block/Pivot Test file is what i used to get the right dimensions for the hole that fits over the pivot (it took me about 6 iterations to get it right, i didn't want to print 6 whole knobs...) The three knobs look identical, but in my car they are slightly different: The middle one (fan speed) needed a slightly shorter cylinder-part. The right one (temperature) had the angle of the flat side different compared to the other two. I'm not sure if this is (terrible/French) design or the years of physical abuse i've put my car through. ;-> Anyway, the script allows for easy customization of the dimensions, pivot angle etcetera. Look at the commentary in the code for more information.A few notes: The knobs in my car are all slightly different. I'm not sure if this is normal, or caused by the years of abuse i've put my car through over the years. ;-> The measurements for pivot radius and flat side are VERY important. A tenth of a mm too big and the knob can spin freely without "grabbing" the pivot it's supposed to control. Too small and the knob won't fit all together. I suspect this also very closely correlates to the precision of the printer. Keep a file ready, or prepare to make a few prototypes.