Start designing. Begin by designing the space (hole) that will hold the flash drive itself. This is a good time to measure the flash drive AGAIN. Measure twice, cut once. A significant part of your grade is based on how well your measurements accurately allow for the flash drive to be hot glued into the 3d print as well as how well the flash drive fits into the USB port.
After you have built the hole you may begin designing the outer case. Don’t start with the case design until you have finished the hole and CHECKED YOUR MEASUREMENTS.
s. Limit your design to no larger than 90mmx60mmx20mm. Keep in mind that the flash drive holder has to fit in ALL USB drives.