I like gears as a mechanical engineer 😉 and was willing to update my door handle, as they are very conventional, looking at door handle from providers, with original designs it could be soon be very costly...

I decided to design it to 3D Print, it took me 5 minutes during my vacations :

1 minute to Access Part catalog and search for "Gears"

Then choose the best shape, and the right diameter , in my case 40 mm.

1 minute to open your favorite Solidworks XDesign, the easy web based app for designer and import the Gear part you selected :

3 minutes to make your design according to your door specifications :

• Here a square cut of 7 mm
• a fillet to smooth the grip,
• a very small hole to fix the handle...

on an iPad, its pretty strait forward, that's it !

Et voila, in 3D !

+ 2 hours after for Fab part, thanks @CC for 3Dprinting on a Ultimaker l 🤩

Here is the result ! This is really only for geeks 😉