I need a split-type trim panel for the existing cold and hot water supply pipes in my sink. I couldn't find one suitable for my application, so I made one myself

There is a hole with a diameter of 0.86 inches in the center of the decorative panel 086.STL.
The decorative panel 0 86 1.STL has a hole with a diameter of 0.86 inches in the center and a 1-inch groove on the front side, in case you need to accommodate a hex nut near the wall.
The center of decorative panel 1 in the STL file has a hole with a diameter of 1.0 inch.
The center of Decorative Panel 1 1.STL has a hole with a diameter of 1.1 inches.
The center of Decorative Panel 1 4.STL has a hole with a diameter of 1.4 inches.
The center of Decorative Panel 1 5.STL has a hole with a diameter of 1.5 inches.
There is a hole with a diameter of 1.7 inches in the center of Decorative Panel 1.7.STL.
There is a hole with a diameter of 2.0 inches in the center of Decorative Panel 2.0.STL.

I suggest using the support placement method of "only where the model contacts the platform" for printing, which is used for pins that protrude from the side. If you use the "everywhere" support placement method for printing, it will generate supports inside the mating holes, which will be very difficult to remove.

The fit of the hole is slightly larger than that of the pin, so it can provide a good frictional fit when assembling the parts together. However, it can also be bonded during installation.

I have attached the original Solidworks file in case you want to edit this design to match your own dimensions.