Hang your external hard drive on the back of your laptop screen
Two hook-shaped pieces snap into a connecting bar. The short hook hangs on the back o...f the screen while the long hooks hold the external hard drive.
If you can spare the extra plastic, it would be better to print one of the hooks that is as wide as your external hard drive so you don't have to worry about the snap-fit connections. These connections are fragile. Also, your external HDD holder will be more robust if it is one solid piece without any connections.
3d model print parameters
PLA
Print at 0.1mm layer height to ensure that the snap-fit connections are of good quality. Otherwise, they wont fit into the connecting bar....