Filament Spool Measuring Tool

This tool will provide an approximation of how many meters of 1.75mm filament is left on a 1.0 kg spool.   Measure from the level of the filament to the rim of the spool, as shown in the photo.

 I've tested it on my eSun PLA spools, and it's a reasonable guide.

Printed in eSun PLA, with a colour change when the text starts.