Under Mount USB Extension Holder
thingiverse
Under mount USB extension holders are specifically designed for use with Monoprice USB extensions, but they likely work with most USB extensions as well. There are two versions of each holder: a non-removable model and a removable one that allows you to take out the USB extension. The removable version even has an experimental design that includes supports. To print these holders successfully, use a layer height of 0.2 or smaller, or else the slicer might merge the supports with the holder itself.
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