I’m printing some cylinders and I’m getting some kind of drops of material on the outside of the walls.

Those drops that you see comes from the printer extruding some extra material after a travel move when the filament has been retracted. To reduce those drops you should find a setting in your slicer called something like “extra material at restart” or extra restart distance" (depends on which slicer you have).

Ok. Thanks! I’ll try that!