Rounded cube
thingiverse
Lot's of housings have rounded edges. With this library you can easy make cubes with rounded edges. If you're looking for a housing with a flat top, you can use difference() to cut of some height and loose the rounded edges on top.
Download Model from thingiverse
With this file you will be able to print Rounded cube with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Rounded cube.