Hi there!
I’ve got a problem… Edges of my models look bad. They are too sharp.
How to fix that?
I have seen tons of haks and they looked very good, not like mine 
PS: I use Blender 2.78 + Neverblender.
It doesn’t look like a smoothing problem, because those 90° angels shouldn’t be smoothed. You don’t want your boards to look round along the edges. This looks like no anti-aliasing, but that should affect all models, not just yours.