Spool remaining calculator
Put the spool on the kitchen scale, read the total weight, subtract the empty spool weight — and you'll know if it's enough for the next print.
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Know the empty spool weight
Every manufacturer uses a different spool weight — usually between 120 g (cardboard spool) and 250 g (plastic spool). If it's not printed on the spool, weigh an empty spool from the same manufacturer once and note the value. Example: total weight 650 g, empty weight 250 g, 400 g of filament remaining.
Is the remaining filament enough for the next print?
The length can be converted directly if you choose material and diameter — that way you can compare the remaining weight with the length your slicer says you'll need.