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I printed a 70 mm ring with the 275.7 mm diagonal length setting, and it came within .1 mm all the way around. If there are finer tolerances to be gained than that, then I haven't got the tools to measure it anyways.

Success!

By plotting the diagonal length values I've tried so far along with their resulting print dimensions, I came up with a new diagonal length of 275.7mm. After plugging that in to the EEProm settings and retuning my Z heights again, the first calibration print was dead on 40.0 x 40.0 mm in X and Y ...

Ah! You're right. I see that now. It had looked like all the version differences had been carried forward through manual revisions, so I had just been following whatever manual was current. Spinning up now for a new calibration print after tuning in new Z heights, along with setting the diagonal rod ...

Thanks! That certainly isn't clear in the instructions, but it would explain the current situation. I'll give it a try and come back when I have some new results.

Hi, all! I just finished putting together a Rostock MAX V2 kit that I bought back in September, and so far everything I've printed has come out just a hair over five percent small in X and Y. A 40mm calibration square I printed came to 37.8 x 37.8 mm, and the 20mm square I printed came to 18.9 x 18 ...