Hebei College of Industry and Technology is famous for its ferrous metallurgy technology. In a charity event, several famous schoolfellows donated millions to the college and received some gifts. These specially designed bottle openers are one of those gifts. It's 3D printed using DMLS technology, which requires no support removal process even for the lattice structure.
Solution
Step 1: Examine the model, add supporting structure and arrange them in the software.
Step 2: Prepare the steel powders and 3D print the models.
Step 3: Break the thin supports with pliers, cut the thick supports with wire cutting. Polish to remove the bumps.