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Re: So what did I do wrong?
Posted: Mon Dec 26, 2016 9:35 pm
by nebbian
Also try measuring the distance between the towers with a caliper. The actual distance between towers isn't important, but the measurement between top and bottom on the same face must be no more than 0.05mm different.
Re: So what did I do wrong?
Posted: Wed Dec 28, 2016 6:41 pm
by Fattymcbiggins
geneb wrote:Grrr. I just checked and it somehow got changed to 7 factor. I've changed it to six and pushed an update.
g.
I don't know what the difference is between 6 factor and 7 factor calibration. But, the calibration tool linked from the Dozuki.com online manual page leads to a page where the result of the calibration process is based on 7 factors. Should I be looking somewhere else?
I have been trying to use this tool and seem to be getting results that are diverging.
Here is a snapshot of my latest result.
Success! Calibrated 7 factors using 10 points, deviation before 1.06 after 0.26
Enter these NEW values TO your EEProm
New Tower Endstop Offsets: X: 43 Y: 0 Z: 42
New Diagonal Rod Length: 304.15
New Horizontal Rod Radius: 150.10
New Z Max Length: 399.59
New Tower Alpha Angles: Alpha A: 210.44 Alpha B: 329.77 Alpha C: 90
Re: So what did I do wrong?
Posted: Wed Dec 28, 2016 8:05 pm
by tjschweizer
Interesting, I was getting a deviation of 0.04mm when using the Octoprint autocalibration script v0.10, then I saw this thread and updated to v0.14 and now the best I can get is 0.16mm.
Re: So what did I do wrong?
Posted: Wed Dec 28, 2016 9:29 pm
by geneb
The 7 factor calibration fiddles with the delta rod length, which can introduce scaling errors.
g.
Re: So what did I do wrong?
Posted: Sat Jan 07, 2017 8:33 am
by Zob
OK, after trying a heap of permutations with arms & hot end orientation, all fruitless, I came across a posting in the forums that vaguely implied that running G29 multiple times might be beneficial.
I ran a G29 five times followed by two iterations of the OctoPrint auto-calibrate. Now reading 0.9, which is, for now acceptable.
More to the point I can print a solid first layer across much of the bed!
The model I was trying to print came out OK first time.* OK, it has a few snots and some light stringing but dimensionally it's bang on.
Thanks to everyone that tried to help. It seems I was just being too thorough by resetting the EEPROM between attempts.
Zob
*well, second time, I forgot to remove the z-height adjustment in the slicer the on first run <hears mhackney saying "I told you so"
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