3D Printed Filament Spool Ruler for 1kg Spools

A fix that fits your shop, not somebody else's.

1.1k downloads in the maker community

$27.11

Color: Gray

Printed in the USA when you order.

1.You order it
2.We print it fresh
3.It ships to you

Measure your remaining filament in grams and percentage so you know exactly when to order more.
Hold the ruler inside your spool and read where the edge touches the filament for instant accuracy.
Made for standard 1kg spools with 200mm outer diameter, saving you time on mid-print guessing.
Print on demand and customize for your own spool sizes with the included formula guide.

You never want to run out of filament mid-print. This workshop ruler solves that problem by giving you an accurate measurement of what you have left on your spool.

The tool works by sitting inside your spool. You hold it so the ruler edge touches your filament, then read where the outer spool edge hits the measurement marks. You get both the weight remaining and the percentage left. It's designed for standard 1kg spools with a 200mm outer diameter and 106mm inner hole. Print it flat with numbers facing up for the best result.

Have different spool sizes? The design includes a mathematical formula so you can adapt and create your own versions. This turns one simple tool into a foundation for measuring any spool you use.