Spool Core Diameter Gauge

UPDATE 2025-09-18: Print Profile for Hi Res Gauge using 0.2mm nozzle now available. Have you ever gone to rip the side off of a cardboard spool to put your favorite master spool on it only to find out you had the wrong diameter core adapter printed off? Have you ever had the same manufacturer change their cores to different diameters? If so, then this is the tool you need. This takes the guesswork out of what diameter the core is BEFORE tearing the sides off. Background: This Gauge is a result of my 3D Printing journey (like many others) starting with a non-Bambu printer, buying a LOT of cardboard spool filament, then upgrading to a Bambu printer with AMS. I like the Bambu filament, but I needed to use the cardboard spool filament I have and Bambu can be hard to get sometimes when I want it quickly. After trying the many rings for cardboard spools out there, I wasn't happy with the result. I then moved on to trying the many Master Spool options out there. Some are good and some aren't,