this is a upgrade of the last bracket i needed a strong bracket, this was printed with pla at 33% infill & 4 perimeters  at 190  c   3mm fillament 100 % speed & flow  it takes 15 hrs. & 24 minutes , 170 grams , the size is 238mm x180 mm it will fit a 169mm wide timber flush inside , just scale it to you size,  i included 2 files one is branded obj & a stl not named . print face down , no supports  cato