Re: How critical is the accuarcy of the different arm lengths ?:S

Quote
ianmcmill
+/-1 mm (measured with double meter stick)

First, I would advice you to use a large caliper, and if you don't have such a tool, a simple tape measure.
Second, if you look to several calibration guidelines, you'll see that they're considering the average of the rod length. Here, your length error is about 1 mm and I think unmounting your rods in order to adjust them will give you some improvements on your future prints. To unglue them, I don't see many solutions. Maybe some solvant?