Actually calibrating delta is easy [groups.google.com]Quote
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I bought the Delta for fun, while the Orca suffered from a blown electronic part, but it is not fun. It looks amazing (one reason to build it ) but quality stays behind the cartesian.
Of course original parts quality has to do with that, as well al calibrating experience, but also those are better adapted on cartesian.
It may require some math skills now. But that is only because nobody bothered to add it to firmware and pc sw.
