filament gauge

This is a filament gauge which can record how many circles the spool has turned. The counter is designed as intermittent gear assemble. For each stage, the input gear only have one tooth, and the output gear have ten teeth and ten circle teeth (the circle teeth are used to stop the output gear rotation). Each stage has the ratio,10:1, so the first dial plate stand for units' place(“个”), and the second dial plate stand for ten place("十"), the third dial plate stand for hundred place("百"), the fourth dial plate stand for thousand place. For 1.75 diameter ABS filament which density is 1000kg/m3, 1kg filament with have the length of 415m. If the spool middle diameter is 155mm, 1kg filament will turn about 852 circles.(Maybe there are more accurate computing methods). So you can record the cirlces of filament to know how many filament you have used. For each new filament, you can turn each dial plate to let the pointer point to zero, which can be called resetting