Brackets for mounting a 2.5" drive in a 3.5" bay. Made to fit the twist lock system in my NZXT Tempest case. Included Inventor part file if you need to change the spacing or hole tolerance. Plastic-saving design with a small footprint that reduces the chance of warping. Symmetrical design for easy install. You may need to rotate it so the flat side is down.
EDIT: Added the Slim variant that removes one of the cross beams. It offers a slight increase in print speed, decrease in material consumption, a tiny tolerance adjustment for the overall width, and reduced chance of lifting.
EDIT: Added double slim variant for mounting two drives in a single slot.