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No. Its not a requirement for any desktop applications. In fact, it technically isn't necessary for most server applications either thanks to levels of abstraction between the hardware, operating system, and applications. Its only needed for high quality applications where missing a single bit could have critical consequences, and even then its pretty rare with the level of quality control these days.
the question is about working with 3D-printer and his software.
Thanks.
And the answer is still 'No, ECC RAM is not required." Buying ECC RAM benefits the hardware vendor, increasing their bottom line, while accomplishing nothing for your user except depleting his bank account.
If your system crashes a lot ECC is a thing you can try (together with Xeon CPU). In my office seems to reduce system crashes on Revit but not with much. There are whitepapers on th etopic - here is one : http://www.intel.com/content/dam/www/public/us/en/documents/technology-briefs/workstation-ecc-memory...