A bit more progress today, although it looks more impressive than it is. The frame is finally taking shape, although there's a lot more fiddling to do before the Z rods shown here move smoothly :(I am having trouble with the X carriage binding a bit at one end of it's travel; until that is sorted I can't assemble the top half of the frame.
I'm also at a loss as to what to do with the Z belt - it needs to be a continuous loop, but I only have a cut length instead. So I have to join it somehow, and I can't find any reference as to how to do it properly. Thankfully the X and Y belts don't have to be continuous, as the ends are clamped to their respective carriages.
Edit: I just got pointed at http://reprap.org/bin/view/Main/AssemblingDarwinMachinery#Z_belt which explains how to splice a belt. While I don't have a belt splicer jig, it shouldn't be hard to make one out of polymorph.
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