As a maker, round door handles are the worst especially when hand are covered in glue, paint, oil, and everything else. This makes turning a smooth, round door handle very difficult especially if you don't want to make a mess.
This was just a simple fix to that problem. The door handle was modeled in Solidworks in about 10 minutes and then sent to my 3D Printer and an hour later my problem was fixed.
See more of my projects at bennychlai.com
This Handle is made for round door handles with a diameter of 50mm.
May fit smaller diameter handles but would need to test out on your own.
Secure with two 3mm Bolts and tighten.
Washers are optional.