Just wandering, how to make those lines to be close one to another?

3D Printing
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@Adam_Steinmark very true, didn’t look that closely, the photos have a lot of flash glare, I would definitely say extrusion calibration is necessary

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Thanks to everybody for recommendations. I was able to find number of issues in printer assembly and fix them. But the biggest issue was the original firmware. After I upgraded firmware to the latest one from 18th of January prints started to work fine.
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Fantastic! I can’t believe I forgot about the firmware updates, sorry about that.

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@Adam_Steinmark Well, happens to the best of us😉
Here is the final result
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Case for Odroid XU-4