Parameterized handle/bracket allows different shapes and sizes.

The parameters allow size of the thing, thickness, wheter it hsa braces on the ends, whether the braces are straight or arched, and the size of a chamfer on the mounting tabs. Also the screw size is a parameter.

Use the parameters in the OpenSCAD file to make just the right size. I printed the brackets raftless, but I noted that the very plain version needed to be really hard on the platform.

I printed this with 50% fill, one extra shell.

After the thing is printed, if it has braces on the mounting yabs, there will be a thin support shell in between the braces. Just cut this out while you are cleaning up the thing. In the image of a single thing, you can see that there is a thin cylinder in the end.