HDPE Cap Opener Tool
This is to open those caps that go on 5 gallon HDPE jugs like this.
At my workplace we work with sticky stuff opening and closing these containers routinely. After a while it gets really hard to open by hand so we have to hit it with a wrench to loosen it or use channel locks. One of my coworkers said, "If only someone could 3D print a tool to open these easier....". Well here it is.