Im sorry but there is no way you can get a free code.
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There is no such thing as a "Builders club code". Perhaps you are referring to Roblox card codes, in which case: why would anybody post one here? If you want a Roblox card code buy a Roblox card and look at the code.
Go to "Builders Club" Click "Roblox Card" Enter the code
There are no "cheat codes" for ROBLOX, since ROBLOX is a multiplayer, online game.
Sometimes Roblox will post codes, there are also gift cards that you can redeem.
There is none. The only "cheat" is repeated guessing and hoping to get an inactive card,though this is illegal.