This is a support housing for installation of a Nintendo Multi-out in a Virtual Boy (powered via a Virtual Tap Mod). Specifically, the Multi-out void is sized around an official Nintendo Multi-out removed from a DOL-101 Gamecube. The VBGTO is a support structure for mounting the Multi-out without requiring any glue (the Virtual Boy has enough of that already) or unsightly screws.

Using a DOL-101 Multi-out is admittedly rather niche, so hopefully these projects can be adapted to utilize the 3D printed Multi-out housing designs out there in the future.