Myself and my wife have had our clotheshorse for a number of years, and the original plastic clips which hole rails have broken. One of the first things I decided to print, even before getting a printer, was some replacement clips for this.

Using TinkerCad, I replicated as best as possible, the original clip. I have however extended and reinforced the hook which holds the arm, meaning the printer version are actually far more practical than the originals, and as such, I have replaced all (even the non-broken versions).