Bug with the money printer

Hi all, its my fist post ^^

I have a darkrp server 2.3.7 and i put 2 printer max, but when the printer destroy that say, i have my max of printer, i tryed this > http://www.facepunch.com/showthread.php?t=786792 but not working.

PLZ HELP

PS: sorry for my bad english im french ^^