well, don't even bother with the crude bots as of now the basic ones do cost exacly the same raw materials. Instead of a crude gear in the basic workbench you make a Gear in the wood router. To avoid the hassle of replacing crude bots and rewriting all those programms build the basic one rigth from the start. If the recipies get changed in future the crude bots could be more important for early game but as of now skip them.