Weird... In 0.13.6 the Stack Inserters grab 13 items when fully upgraded... Don't know why, but they definitely grab 13 (1 base + 12 bonus) and not 12. Maybe 0.13.6 has changed the stack size once more...Neotix wrote:AFAIK Stack Inserters can grab 12 items at once and normal inserter can grab 3 (botch fully upgraded). When both work simultaneously we get 15 stack bonus that can be used for steel production. For stone we can use only stack inserter with 12 stack bonus.
On weekend I will try to build smart furnace based on this idea.
Otherwise I would have tried the 12+3=15 combination for Steel (albeit quite the contraption compared to how easy it was back in 0.12) and also used the Stack Inserter for Stone.