They were able to design, fabricate, and assemble a relatively large robot for around €8,000 (US$11,000) including servo motors and electronics. That's about a third the cost of commercial robots in the same size category like the
RQ-TITAN, and is still cheaper than smaller humanoids like the
Aldebaran Robotics NAO. And best of all, they plan to make their design open source.
One of the ways they managed to keep the cost down is by using lightweight materials, which means the robot requires less powerful (and cheaper) servo motors.