Made this because I keep changing between the 0.4mm nozzle and the 0.8mm nozzle and forgetting which one is currently in the hot end. The arrow might be a little obsolete because you can just see which nozzle is missing but I think its pretty cool.

I stopped the print near the top and changed the filament colour to get the numbers.

https://youtu.be/GBocAUDWhzg