The RapMan 3.1 may sound more like a new rap artist than a prototyping machine, but don’t be fooled. This 3D printer developed by Bits from Bytes is a DIY kit and includes an upgrade that allows a second printer head to be added to the machine. This means two different types of materials can be printed at once, which adds much more versatility to the end product. If you already have a RapMan with one head, the upgrade is available for £149.50 (approx. $230). A new two-headed printer costs £1,050, or about $1,615.

“Paul Sagel is the inventor of the Crest Whitestrips, one of the most successful new product launches at Procter & Gamble in many years.  The key moment in selling this radical soft innovation to a very large bureaucracy came when he pitched it to senior management.

“He did two things.  First he brought in the parts for his prototype and built it right there, on the spot, to show how easy it was.  Second, and far cooler, a few days before the meeting, he had his teeth whitened.  They glowed.  Paul, it turns out, was the prototype.”

Seth Godin, Free Prize Inside (Portfolio)