UPDATED: Now has slide in bay for Pi3.
Slide-in bays can be secured with M3 screws. Room for many cooler/HATs on Pi boards. Drive bays will support all current MyPassport capacities (up to 6 TB). Includes files for 1-4 bays, but SCAD file can be used to create larger racks based on printer volume.
OpenSCAD files require use of honeycomb scad library by Gael Lafond at https://printables.com/model/263718 and raspberrypilogo-fixed.stl by Lemmesky at https://www.printables.com/model/14260-raspberry-pi-logo-fixed (both included and shared under the Creative Commons License) and the nutsnbolts library at https://github.com/JohK/nutsnbolts.
The author marked this model as their own original creation.