The group from SparkFun Electronics could open a SentrySafe safe in around 30 minutes.
The robot can decrease the quantity of conceivable blends from one million to only 1,000, preceding rapidly and consequently attempting the rest of the mixes until the point that it softens up.
After the robot found the mix was 51.36.93, the safe popped open - to upbeat commendation from the group of onlookers of a few hundred programmers.
SparkFun's Nathan Siedle told the BBC: "That was one of the scariest things we've done. Loads of things can turn out badly, and this was a major gathering of people.
"We're truly glad it opened up."
A representative for SentrySafe couldn't be come to on Friday.
Be that as it may, addressing Wired magazine recently, when the group exhibited its technique on a littler safe, a representative for the protected producer stated: "In this condition, the item expert what it was intended to do.
"[It] would be practically exceptionally troublesome, if certainly feasible, for the normal individual to imitate in the field."
The most recent exhibit was performed at Def Con, the biggest social event of underground programmers on the planet.
The SparkFun group was not ready to go with a profound safe, thus purchased another one that was opened up interestingly in front of an audience.
The group kidded the safe could have been split sooner - however they needed to fill their 45-minute schedule vacancy.
The robot, which cost around $200 to assemble, makes utilization of 3D-printed parts that can be effectively supplanted to fit diverse brands of blend safe.
It can't break an advanced bolt - in spite of the fact that vulnerabilities in those frameworks have been uncovered by other hacking groups previously.
The collaboration started when Mr Siedle's significant other Alicia purchased a safe on eBay that was shoddy because of the past proprietor not recognizing what the mix was.
"She offered it to me for Christmas," Mr Siedle said.
The component in the protected comprises of three dials which, when adjusted, enable the safe to be opened. Each dial can be any two digit number - meaning one million potential mixes.
In any case, the robot doesn't just attempt each blend. It can suss out one of the dials inside 20 seconds by identifying the span of indents on the dial. In basic terms, the "arrangement" indent is marginally bigger than the "off base" indents. In the show, this technique implied the group found the third and last number was 93.
The other two dials can't be measured - however disposing of one significantly lessens the quantity of conceivable blends.
It was made less demanding when the group likewise found that the protected's outline takes into account a room for give and take to make up for people getting their blend somewhat off-base.
For instance, on the off chance that one dial is set to open at 14, utilizing 15 and 13 will fill in also. It implied the robot could check each third number, making it conceivable to rapidly test the rest of the blends considerably quicker than an individual.
Utilizing this technique, they could chop down the quantity of conceivable mixes to around 1,000 - a much more sensible test.
Prior to the endeavor, Mr Siedle told the BBC the robot could be effectively adjusted to handle any mix safe.
"We composed it for a specific sort of safe, yet it doesn't generally make a difference - you can really 3D-print a coupler that can coordinate any protected that you may have."
Some SentrySafe models accompany an extra bolt and key, yet the group could open it by utilizing a Bic pen.
"Regardless of how much cash you spend on a protected… nothing is impenetrable," Mr Siedle said.