These are clothes rod ends. They are designed to be very strong and orientation is IMPORTANT. I printed them in Prusament PC blend because the regular culprits (PLA and PETG will creep until failure). The layers lines are oriented so that they will compress under load and the tensile stress is mostly on the line placement. If you decide to print in PC you either need a really good build plate with the proper adhesive or a raft - the raft worked well for me as there was still warping but the raft absorbed the warping but kept the print tight on the bed. The warping was not such that the part could not be used. Just be aware that the raft will make the front of the part… rough. Yes they have a hole underneath for the screw to retain the rod and keep it from falling out or moving.
The author marked this model as their own original creation.