Filament Spool Diameter Checker

We all know that the Bambu AMS only allows spools as large as 202mm in diameter. Sometimes, when adding an edge protector to a cardboard spool the diameter goes over that limit. This causes all kinds of problems with the spool hitting AMS cover or the back of the AMS. The easiest way to check is with calipers, but most don't go that large. Checking with a ruler works but can you really tell the difference between 202mm and 203mm? My old eyeballs can't. I created this gauge to quickly check that the diameter is 202mm or less. All you need to do is swipe this gauge across the spool in several places to make sure that is is less than the 202mm of the gauge.I hope you like it.