This is a strong corner for fixing three planes. Print as in the screenshot. Added a new v2.1 version! The area of contact with the planes has been increased by adding small overhangs that do not affect the print quality. Added a new v2 version! Removed overhangs for simpler print quality. Increased base area for better adhesion.
I’ve got some crappy drawers that are falling apart this might be just right to fix them