Description
This tool lets you know how much filament you have left on a spool without disconnecting the spool from the printer. This particular tool works with spools with a outer diameter of 200mm and a 90mm core.
You place the tool so the face of the tool is flat against the inside wall of the filament spool. Then lower the V portion of the tool onto the remaining filament. You can tell how much filament you have by looking at face of the tool and seeing what numbers line up with the outer rim of the spool.