I began printing the parts for the Ultrascope DIY telescope designed by the Open Space Agency. See http://www.openspaceagency.com/ultrascope.
All of the STL files for the 3D printable parts are canted 45 degrees. Brackets, tubes, everything I have seen so far. Is there a reason for this? I printed one part last night and simply rotated the part so it would lay flat because I didn't want to deal with supports. I am relatively new to 3D printing -- Am I missing something I should know? Is this a thing?