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When I print this file, one section smears. The print head is dragged through the soft filament.

At first I thought my aluminum bed was warped, so I upgraded to a glass bed. Test prints were much better, but still had a section that smeared.

My suspicion is that one of the motors needs to be adjusted just enough to balance out the one sector where the print head is too close to the bed. Is there an easier way to calibrate? Is it even possible to do a manual calibration on a per-axis basis on a delta-style printer?

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    $\begingroup$ Like a previous comment mentions about the rarity of Delta questions, could you provide a picture that we can see what is happening? $\endgroup$
    – agarza
    Commented Aug 26, 2021 at 3:36
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    $\begingroup$ Is it even possible to do a manual calibration on a per-axis basis on a delta-style printer? - I think this is covered in a very old question: see my answer to Delta printer nozzle not moving square with a perfectly level bed (as if the bed is bent… but it isn't). IIRC, you calibrate each tower in turn, starting at time 13:37 in the video. Does that answer your question, or have I mis-understood..? $\endgroup$
    – Greenonline ♦
    Commented Aug 26, 2021 at 15:35
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    $\begingroup$ I'd love to watch the video, but it is marked as private. :-\ Could you make it available to me? $\endgroup$
    – Dennis Wurster
    Commented Aug 28, 2021 at 1:16

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On the monoprice mini delta the leveling is done automatically and proportional to the motor height. If a sector stays non-flat, there is not much to be done about that. Is the glass bed absolutely level? Test with a metal ruler perpendicular to the bed. Maybe you clamped the glass bed to a n aluminium bed? It is very easy to bend glass so it can't be made level anymore. Try letting the glass bed "float" on top of the leveling buttons.

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