OK, here are some cartoons I drew to help define the BuckyBot.  We've been keeping this in our heads, and one thing the hackdayprize is forcing us to do is to document all this stuff.  In lieu of CAD drawings (which will be presented on these pages as time grinds on) we will start will these sketches to 'splain ourselves.

In 30 years of engineering I've found that the hardest and most time-consuming task is to document your work so that others can get it.... so, I start here with my equivalent of pencil sketches.   There STILL is no single application that makes it easy to transfer concepts and work from one's brain to documenation!

First, we show a hexapod BuckyBot with an extruder mounded underneat on a 6DOF Stewart Table

stewart bot cartoon

This bot is using a remote filament spool, and has an articulated ring to act as a low-tension ferrule to guid the filament into the extruder.  This configuration has some disadvantages, as it HAS to remain normal to the direction of the build.   Below, we show how it would print its first course of half-octahedrons:

 stewart bot printing

 The first design requires the BuckyBot to straddle its workpiece as it builds, the second requires the BuckyBot to climb the sides of the Antecedent (see? … much more concise...) as it builds.

Yes, I know what the extruder hanging underneath looks like ...

A second concept uses a cantilevered (a much fancier term than "hung on one side") 6DOF arm:

Cantilevered Arm

Notice the nice counterweight used to offset the moment created by the extrude head on the arm.  Of course, making the first course follows as you'd expect:

canti first course

Instead of stradling the antecedant, this guy has to tilt its arm and its body to climb.

IHere is the concept of building a wall out of octahedrons:

tilted octahedrons

The Bot simply tilts succeeding coursed of octahedrons a fixed angle as it climbts.  This requires the first course in each tilted section to add a wedge in the next octaheadron (however, the succeeding octahedra in the section are not wedged).    We'd have one Gcode file for a half octahedron (for the first course), another file for a "normal" octahedron (for the majority of courses), and a file for "wedged" octahedrons (for courses transitioning from one orientation to another).  Here, for example is a wall of octahedrons in which each section consists of four courses of "normal" octahedrons transitioned by one course of "wedged" octahedrons:

five degree wall

That's all for now ... more to come, though.