Strange lightning - what is wrong with my model? I am a total beginner in modelling but would claim to know the basics.
Here is how my model looks rendered in blender:



As you can see there are many strange ligthning artifacts, and the edge is not lit how one would expect. The beveled faces at the edges of this thing look weird, too. 
The normals seem to be correct (I also recalculated them):



So what am I doing wrong here? It is worth mentioning, that this only occurs when i triangulate the model. Before that, everything except of the beveled areas looked okay. The artifacts vary in size and intensity when i subdivide the faces even further.

What am I doing wrong?
Try turning on this, and play with the angle setting. 

This model is a bit of a mess though, so many triangles, some don't look planar, those things are going to ruin your shading. Try to keep everything as quad as much as you can.