frame brace for Anet 3D "Anet A8" model Prusa i3 3D printer aka "Omni" aka "m-505".
Acrylic framed printers with 5 button next to LCD screen.
install under the y axis motor to reinforce acrylic frame from bending due to tension of belt.
3rd and 4th photos show how the acrylic frames are bent under stress,
and the belt tension wasn't that great.
senhai, hesine, alunar 5 button printers maybe the same things.