Printed in PLA. Have to make hole in orginal hotend shell to have acces to extruder rotating screw. You can use Front Plate with Hole with this Visualisers. https://www.printables.com/model/1284345-ender-3-v3-ke-custom-front-panel-with-hole-for-ext
The author remixed this model.
Changed dimensions and added bar that fits into screw head to hold visualiser more firmly in place while is rotating