I drew the design in Fusion360 just to test the printers possibilities to print a usable handle for doors etc. Handle ended up being very strong and durable, tested it on my garage door and it worked fine. I may have to draw a bigger version for bigger hand, my hand touches little bit on the handles back wall when used.

Oh and the color is blue because my last filament pool was blue.

UPDATE
I edited the design for a bigger version to fit even bigger hand. V2 was around 29mm and the new V3 version is 39,3mm deep inside the handle. I left the older V2 design also if needed.