A squeegee/window wiper holder, made to be mounted on a metal sheet, it has built-in support so it can be printed at an 45 degree angle.

It requires 2 M6 nuts which you glue into the pockets inside the part, and 2 M6x16mm bolts, but you may need a different length depending on what you mount it on, i would also recommend some washers but that's not required.

You could alternatively get some suctioncups with M6 bolts embedded, then you could mount it anywhere.