Here's the finished (well, you know, in a rough prototype kind of way) printer.



there are only 3 controllable ports on the rcx brick i used, so one for x, one for y, and one for the extrusion control. you'd need to gang two rcx bricks to further control temperature and the z axis.



I did end up doing 5 layer builds of 3D things like the letter A. unfortunately without a release / support material the geometry is limited, but it was still cool.



hopefully someone will rebuild this and simplify it.