It is not easy to pass , especially on the angles , but leveling the table was only one thing that helped and I tried everything possible , there is no shortcut , you need to go through with a steady hand .
I don’t know about a bug , but I see others with a scores of 0.0400
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and what about the failure on 22/23 ? is there any other solution maybe to increase the light in the room or something else?
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I calibrated in complete darkness as it uses just infrared for calibration . It do not calibrate the RGB camera . Only the left and right Depth Cameras . So one time you calibrates the right side and other times the left .
There is no special thing you can do to make it easier .
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Hmm, this is interesting. I did accidentally calibrate without a proper angle in stage 3 several times. One passed the calculation but the result was around 0.15-0.18 I believe.
That what many people did , they even move the calibration board in place of the scanner , that is not the point of proper calibration , and as hard it is , there is no other solution , level your table and kero your hand steady , the first time ever I tried , it took me over 20 min per one calibration and I fail like 5 times in the process , but my last 2 calibrations was fine , now I have 0.0680 and I am not bother to get lower, my scans still looks as good as they where at 0.0980 or 0.0500
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Thank you. 
your replies make me feel more comfortable with my calibration result.
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Of course , don’t get yourself obsessed with it , that are only numbers , I would be more concern if you got over 0.2 or higher , but 0.5000 is the borderline and you are far away from that value .
If you have serious issue with calibration , usually you will get tons of very bad noises like carpet .
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now how to get past 22/23 which keeps calibrating error ?
I wish I could help you , what I was doing is going up and down until I found the sweet spot , seems the vertical position is very sensitive at 22/23
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I feel like in your case might be from a USB port. I did try with my old surface pro with 1 USB 3.0 it is impossible to pass like 1-2 steps then the square dotted line was frozen. As I remember in my good machine once plugged in a different port I got an error (usb3.0 but not high speed one).
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@lotte the square/horizontal line sometimes seems like don’t react or responds to the gyroscope at 22/23
to avoid any USB issues while calibration, I would recommend to use the power bank or AC adapter as separate power in place of a single USB cable and see if it works better . But no matter what you do, it is still a challenge .
In the first place, is this the board used for calibration?
No matter how you think about it, it doesn’t even become horizontal, and the support that determines the angle is too loose for the mounting part to reach the expected angle.
I don’t understand what to calibrate with such a poor thing.
I understand any tool that calibrates humans.
OK guys , I made some tests and found out that you need proper light conditions to make the calibration go easy , this will rise the gain for the dots for faster tracking of the device , I was able to calibrate in couple of minutes , however you need to go slow , if you failed with your calibration then there was too much light , and the device captured the smaller nearby dots in place of the big , it is like in the marker mode .
This is only an option to improve the speed . I did not experienced any issues with 22/23 or other one that was more difficult before . However I failed couple of time as I had too much light and was going too fast .
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This was very frustrating to say it in a nice way. What i found is go to a well lit place i did it outside on my porch not in direct sun. Take the handle off the scanner. Sit down cross legged hold the scanner with both hands rest your elbows on your knees. There is a dotted center line that needs to be lined up on the green line when it finishes that stage. Pull the scanner up higher than it should be. Tip and rotate the scanner very little until you see that dotted line match the horizontal line then slowly move down until you get to the right hight. Very tedious so be patient doing it right the first time is worth all the times doing it wrong.
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