Do you have an air gap by your sink that dumps water all over the counter whenever you run your dishwasher? The idea behind this part is to prevent this from happening to you.
Simply measure your air gap shroud and set the clip_id variable to this value. This alone might be good enough to get you going. Then print and clip this around the shroud. The walls keep the water contained, and the base will allow the water to flow into your sink, instead of on your countertop. You can adjust the length of the walls in case your air gap is far away from the sink -- just change the variable trough_length. You can even play with the rear clip opening, as well as the angle of the walls!