AlexSome steel 0.4mm nozzles from aliexpress are really hit and miss once you put them under a microscope.
First image is a brass nozzle from aliexpress (for comparison), the remaining two images are of steel nozzles of varying quality.
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.