A vertical stand for the WD Elements 2.5" portable disk. The disk can be inserted upwards or on its side. Other disks that are about 18 mm thick at their sides and 21 mm in the middle should fit as well, you can of course scale the model to your wishes.
I recommend to print this in a flexible material, but plain PLA or ABS should do fine as well.
Next to the regular model, a second file is included for use with Slic3r that contains some internal structures in an attempt to circumvent issue 1815 until it is fixed.