It’s not that the chains are not good, but with more experience, we are seeing
issues with the chains and speculation is that other things may be better.
until they are tested, we won’t know.
And even if they are tested, the tests need to be replicated by multiple people.
Bar’s inital machine went through a bunch of variations (he shows one version
that had MUCH heavier chains and over a half dozen bricks for example) and was
very reliable and accurate for him
but when people attempted to duplicate the machine after receiving their
kickstarter kits, his accuracy could not be duplicated. When he built another
machine, he had trouble getting it accurate.
We have gone through many iterations of improvements to the machine, and the
software (including calibration), and we are far better than we were. We don’t
know what remaining problems and improvements there are waiting for us