These are racks for external Hard Drives. There are 3 files.

1. external case 1 - Is just one rack to hold 1 drive. (2 hour print) 2.external case double - is 1 rack that will hold 2 drives side by side. (3hour 45 min print)
2. external case double fan - is 1 rack that will hold 2 drives side bby side with a mount to add a 120 mm fan. (6 hour 10 min print)

The single case can be stacked on top of each other. The double case can also be stacked. If using the case with fan mount, use that one for the bottom rack and but the regular doubles on top.

These models do not need supports.

I printed in 100% infill with 0.3mm layer height (high infill because I use ABS)

YOU CANNOT FIT 2 SINGLES SIDE BY SIDE ON A DOUBLE RACK!