It's a towel holder for a glass bath door - three different corner and end pieces join ¾" steel conduit.
Conduit was spray painted aluminum for aesthetics and rust protection, and later gently hammered in to the end cubes with added epoxy. PLA was used with 30% infill. One small side crack developed - perhaps 50% infill would be a better choice.
End pieces were secured to the glass with silicon adhesive - holds securely and is removable.
The author marked this model as their own original creation.