Functional Hourglass

This is a fonctional hourglass.Time depending on the salt used (size and humidity of the grains), I uploaded 3 versions with 3 different diameters.For example, with the 2.8 mm diameter, it needs about 40 second to go down (the video is accelerated).Screw the open side of the hourglass with the top part and then screw the last part.The hourglass is thin for the transparence so be gentle when taking it out of the buildplate ;)Fell free to send me a message if you want to try another size or diamet