Non tested joint designs

I designed these joints on blender, they aren't ready to use quite yet, I tried to make something that you could use in your designs.

However, I just started to use Blender these days and my 3D printer haven't arrived yet, so I can't test those right now and they will propably not work quite right.

Therefore, if you want to 3D print those, please, comment about your experience with these designs so I can try and fix them.