Imagine a robot that can walk, without electronics, and only with the addition of a cartridge of compressed gas, right off the 3D-printer. It can also be printed in one go, from one material. That is ...

At the root of the discontent is the industry’s “razor and blades” business model, which involves selling ink-jet printers very cheaply, then making the profit from high-margin ink cartridges.

The initial kits include solderless electronic modules and wireless components, along with instructions on how to 3D print more parts and assemble the official designs, starting at $29.99.

Forbes contributors publish independent expert analyses and insights. Michael Molitch-Hou covers 3D printing and is editor of 3DPrint.com.