Filament Ruler for 1kg Spools, Weight and Percent Gauge

Design preview. Rendered from the file, not a photo.

The maker says it fits: 1kg filament spools. See the proof

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What it does

Shaped to slide inside a 1kg spool so you can check filament left at a glance
Marked scale lines up with the spool edge so you can read weight and percent
Sized for spools with a 200mm outer diameter and 106mm inner diameter
Small flat tool that sits with your printing supplies so it is easy to grab
Made to order in the USA after you place your order

Makers who load a lot of spools know the guessing game. Is there enough filament left for one more print, or should you order a fresh roll first. This filament ruler takes the guesswork out of that question. You hold it against the inside of the spool, touching the filament, and read where the outer edge lines up on the scale.

The tool is shaped to match spools with a 200mm outer diameter and a 106mm inner diameter, the common size for 1kg rolls. The printed scale shows both grams and percent, so you can see at a glance how much filament is left before you start a new job. It is a flat, simple shape that fits in a drawer or hangs near your print station.

This version is built for standard 1kg spools only. If your spools are a different size, this ruler will not read correctly, since the scale is matched to this exact spool geometry.

1.1k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: 1kg filament spools

That is the maker's word, not a fit we measured. Check the size below against your own.

1kg filament spools (model 1kg)From the maker's own listing notes, checked 2026-08-13. See the original post

Brand names here only say what this part fits. We are not connected to those companies, and they did not make or check this part.

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.