This is an update to my previous hard drive enclosures, but it standardizes both sizes and includes a box that you can put them in to keep stuff organized.

Print the tops of the enclosures flat, with the tabs horizontal.  This will require some support, but not much.  My printer was able to bridge the rest.  The enclosure body  and the box can be printed upright.  I used buildplate suppports for the enclosure body but I think my printer probably could have bridged just fine.