You may have seen our previous post on RepRap a few weeks ago. See the RepRap development source. Briefly, RepRap is a form of Universal Constructor. A Universal Constructor is a machine that can copy itself. The idea was originally von Neumann’s.
The chips come in kits that must be soldered and surface mounted.
Here is Edward and a friend working on the Motherboard and Extruder Controller.
You can continue viewing the progress of this on the wiki.