Many technical problems do not need a new device but a connecting part: a holder, cover, bracket, adapter or small enclosure.
Such a part has to do more than fit. Cables must be able to move, screws remain accessible, heat escape and mounting must not damage the existing device.
Define attachment points, forces, available space and the parts that must remain accessible. Then measure the surroundings and draw the interfaces before making the outside shape attractive.
Consider disassembly, material and load. Threads directly in soft plastic require different choices from a metal threaded insert; wood screws, bolts, clips and adhesive each have different advantages and disadvantages.
For almost any part where fit or ergonomics are uncertain. A quick print or simple handmade model can test position and accessibility before the final part is made.
3D printing, Metalworking, Woodworking and, where integrated circuitry is involved, Electronics can complement one another.