Carbon rods can be cleaned with the Klippy.
This works even if the lid of your Bambulab printer is closed.
Isopropyl alcohol should be applied to the paper towel beforehand. Then place the paper towel on the Klippy and grab the carbon rods.
Now just move it back and forth a few times. If necessary, repeat the process a few times until the cloth remains clean.
The advantage of this tool is that you don't need a lot of material to print it.
To assemble you only have to press 2x 20mm filament into the joints.
The paper towel can simply be thrown away after use
With PETG, the support has PLA at the top and bottom or vice versa.
It also works with normal support but why do you have an AMS ;-)