With having many printers keeping track of nozzles can be a pain. Some have hardened, some don't, some have 0.4mm, some 0.6mm, etc.

So i designed these.

they slide side by side in the top 20x20 rail and you flip it up, the direction that allows you to read what nozzle type is in your printer.

I print them face down on a PEO Plate for the finish, but can be stood up with supports as well. Tree supports recommended for the rail tabs but probably not needed.