With these fake patch panel you can easily mark and organize LC cables, when swapping a switch.
They are labeled 1 to 6 and 7 to 12, as many switches are arranged this way.
In case you are working on more than one switch, there are 3 sets labeled X1 to X3 on the side.
There is also a 1 to 2 and 1 to 4 version.
Print with magnet holes up, no support needed.
Optional add 4x2mm magnets.
As there are different tolerances, you may need a drop of glue.
(aliExpress amazon.de affiliate links)
Let me know, if you need a different versions (eg: ports, labels).
Also see my other network equipment: