Here's a mount primarily intended for mounting an SSD in a tool less HDD caddy. It'll work fine with screws, you can simply screw into the plastic, the tolerances are large enough for that. It will permit you to mount any 2.5" device to a 3.5" bay.
Lots of space around it for airflow and tapered fittings so nothing's loose or vibrates around.
Second picture just to illustrate the real printed part.
Optimised for ABS.
Printed at 0.2mm layer height, I suggest using supports, they'll be tiny and will snap straight off.