A small cable channel designed to mount on the underside of a desk placed close to a wall when mounting to the wall would be difficult.
It should be printed standing up, as it does in the picture, and at 100% infill. If it is too short or if the inside size of the channel is too small it should be as simple as resizing the relevant axis in your slicer. The main concern when scaling up or down would be the screw holes.
The author hasn't provided the model origin yet.