Remaining Filament Counter

Does anyone know of or come up with a fairly accurate remaining filament counter that could be adapted to the AMS ?

剩余耗材估计器 来自 Northeast Tiger Walking Again - MakerWorld
You can try this

I bought a small scale to weigh the spool to know how much is left. A spool weighs about 210 grams, the refill core weighs about 40 grams (so a refill core on a spool weighs 250 grams when empty). The slice tells you how many grams a print will take.

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Great idea, I just happen to have a postal scale
thank you