I’ve drawn a small box 1" x 0.5" x 0.3" that I would like to have tapered sides so it can be more easily injection molded. I want to taper the sides by 1 degree but I can only figure out how taper the sides by “Distance” and don’t know the distance I would need.
Well, from basic trig a 1 degree taper causes a slope of 0.01745, that is, a decrease of that times the length of the taper. You will likely have to scale you block up while making such a small change or you will likely see issues due to SketchUp’s merging of vertices closer than about 0.001".
In a former life, I did 3D modeling for injection molds. The OP’s issue with draft was commonplace. One of the more difficult shapes was simple in concept: