Door handle fitting with a hole of 8.8mm on 8.9 mm
Including support inside the hole.
Could be also printed without the support if its printed in the Z axis (needs to be rotated) but then it would be less strong regarding the force coming from the hand
I added also the blend file, so you can adjust the hole size to fit for your needs, using the low poly version of the mesh.
The sculpture is applied on top of it using multires modifier
the support can be adjusted using the array modifier