Possible to limit craftable amount?

pretty good plugin, but as title says, is there a way to do it? bcoz i dont want a player to be able to craft more than max 1,well they can craft another one if they destroy the previous one but i dont want to see a player to craft like 20 recyclers and place them everywhere... 

Also 
"1. Enabled for personal recyclers (placed by player)": false,      
This option, what does that mean exactly? 

That option is for pickup. Also entity limit will probably not work with it Ryan