Blackboard corner

This is a new and reinforced spare part for the blackboard. I guess it wil works fine for most of 20 mm aluminium profile but please download the stl model and check the geometry. There are tons of blackboards with 20 mm aluminimum profile out there. I strongly recommend to print it form PET or even ABS because it is pretty mechanically stressed, that's why it is also full and massively reinforced.