Squadretta Angolare X Y Z - Angle Corner Support

This is an angled support intended to be mounted inside the inner part of a wooden box. I am about to build a box for my 3D printer as I want to keep the inner part warmer and will add a fan to extract plastic fumes (with carbon acrive method).
The support is 3,3 cm x 3,3 cm x 3,5 cm . The holes are 6 mm diameter . Precise measures are on the annexed Jpeg pic .
It is pretty ragged , I printed with infill 20 % , speed 60 and it took 30 mins to end 1 of this .