This is a 3D-printed "dragon head door knocker" launched by Spanish artist Sonia Verdu. It looks quite exquisite and has a strong sense of antiquity, seemingly no different from a heavy iron door knocker. This is mainly due to Verdu's superb coloring technique. To make these 3D-printed door knockers look more like iron ones, Verdu used a mixture of Epoxy XTC-3D resin film and iron powder, and also used ammonium chloride to give it a natural rusty appearance.

Colorization video: https://v.youku.com/v_show/id_XMTU0Mzk5NzYyMA==.html?spm=a1z3jc.11711052.0.0&isextonly=1

Original model website: https://www.thingiverse.com/thing:1458545

On the one hand, the website doesn't have this model, which is a shortcoming. I made a video introducing this model, but I didn't have a better way to share it, so I uploaded it here;

In addition, the supports of the original model are prone to breaking off during the printing process. I had this problem twice during printing, which resulted in failed prints. Therefore, I added and reinforced the supports at the support locations.

The model is not original. If there is any infringement, please contact me to delete it.