Corner bracket

I was building an enclosure for my 3D printer and needed corner brackets. I designed these 20 x 20 X 40 mm & 20 x 20 x 20 mm brackets with 3mm holes in them. The 20 x 20 x 20 are made to hold 3 planes and the 20 x 20 x 40 are made to hold 2 planes.