This is a low profile VESA mount adapter for the Acer Sb230. The adapter is strong enough to hold the monitor in both landscape and portrait mode. The tougher filament you use the better but even PLA perfoms well and without deformation.
Detach the monitor from its stand and unscrew the mounting plate. Attach the original mounting plate + screws to the adapter. Secure the adapter with M5 screws on any VESA 100/75 monitor arm.
The author marked this model as their own original creation.