Use this system on www.primedice.com:
Click: Get free BTC
Then on the mid-screen select: BET MAX (you can get the free deposit every 60 secs!)
Then select your winning changes as 10% - you might have to repeat this up to 10-12 times, but then you will have multiplied your free deposit by a factor of 10!
After that, go to automated betting on the bar on the left.
Select winning changes as 90%, roll dice 50 times.
Repeat until you're satisfied with your outcome.

This system will work 90% of the time to get you to a good amount of BTC's to cash out.