Originally Posted by
queens_ransom
It's a total of 310 sturdy bolts for the whole event actually, because the lv. 3 Light Tower required 50 sturdy bolts. But for the crafting part, you are correct. ShibuyaCloth has provided a helpful table on page 1 as well.
I need another 115 sturdy bolts myself, but I'm not chopping more than absolutely necessary before spraking rock starts dropping from rock outcroppings as well, so I don't waste energy. But then again, I have some stored energy and am not dependent on the free refills, so I can do my chopping whenever I like. My calculus would probably change if energy was my bottleneck.