CR-10 Frame Stiffener Attachment

I really like the simple and robust design of the frame stiffener mount by cigp. I took the f3d archive and made some changes like adding a flat interface for the external nuts and tidied up a lot of the geometry and also adding radii. The CAD is also a lot easier to modify for those who have different printers or want to use different components.

http://www.samjohnston.net/blog/2018/9/6/cr10-z-brace-stiffener-remix