This is a strain relief for the HTC Link box.

You never lose your plugs anymore, just put the linkbox inside of the box and close the top.No need of screws.

After the print maybe you need to optimize the insert ab bit so that it fits perfectly.This optimization is caused by diffrent accuracy of printers or the fact that the material can shrink at the print.

But all fits great and this strain relief will make it easier for you to move arround with your HTC Vive