Filament length indicator+clip

FOR PLA 1.75mm
i got jealous with spool filament indicator. so i made custom for my spool.

i use this calculator
https://jscalc.io/calc/1Cj6c1zxnr4q8Tzw

i used this clip mix (you can print any clip and glue the filament length spool estimate)
https://www.thingiverse.com/thing:224791

before glue make sure top line indicator is meet full length of filament 1kg.

u need to adjust size your full spool 1kg as accurate as possible for resize.

this is my spool size.
inner diameter=78mm
outer diameter (full 1kg)= 186.8mm
width= 55.8mm

unit used is meter (m)