There are two ways to tip craps dealers:
A Hand-In.
Throw the chips on the Craps table. But don’t forget to say “For The dealers”.
Bet for the dealers.
You can simply make a bet for the dealer. In the case of a win of this bet the dealer gets the bet itself and the amount won.
When to tip
It is up to the player to decide when to tip. The player can do it during the game as well as after it. Most dealers probably prefer that you tip as-you-go, because you might bust out and not have any money left at the end of your session to tip with, but this is not to your advantage, of course. The smartest approach for a player is to bet for the dealers during once or twice early in the session, and do the rest of your tipping as a hand-in when your session's over. Early tipping allow you to get the best service and avoid tipping too much later.
Which bets to make for the dealers
Of course the dealer will be grateful for any bet you made for him, but most of all like a real gambler he will appreciate bets with the lower house advantage.
Dealers hate the wrong bets because they don’t let them double or triple the tip.

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