High Pitch remix of the Flat Pocket Whistle by @PhoneDesigner
Printing Instructions: Same as original
I recommend using a nozzle size of 0.4 mm and a layer height of 0.2 mm. Don't use supports. It's very important that the first layer is perfect, because the wall thickness at the top and bottom is only 0.6 mm. If your printer is well leveled, however, there should be no problems.