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Brummie
With my current setup I can print a 20mm cube in spiral mode at 120mm/s and result is ok.
As soon as I turn off spiral mode, print failures arise on all ends.

Can you be more precise? What were the problems? Have you calibrated the extruder steps/mm? Are you using pressure advance?

Edited 1 time(s). Last edit at 01/22/2019 11:48AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Have you calibrated the extruder steps/mm?

Sure!
And I measured filament diameter for serveral meters

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Are you using pressure advance?

I try to avoid sophisticated stuff, that I don't understand. So, no!

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What were the problems?

I started calibration with retract 0 and 100mm/s (same speed on all speed categories, except traveling, which is 300mm/s)
Acceleration is 3500mm/s² ...
2 perimeters and no infill
Slicer: slic3r PE 1.41.2


Then I adjusted retract to minimize stringing and oozing and came to this result


Note the holes in the walls. They appear on every side, so its not caused by retraction.
I tried to close the holes by rising temperature, which did not lead to success.
Then I tried to close the holes by lowering speed.
As I wrote, I stoped lowering speed at 55mm/s - didn't want go slower.
Picture does not change much on changing temperature or speed.
Finally I checked influence of acceleration - no change at different accelerations.
So I think, there must be another cause.

Filament is ASA from material4print and they state, that it has been tested at 120mm/s
I would be happy, if I would reach 100mm/s, but 55mm/s is so poor

Have you tried reducing extrusion temperature?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

below 260° the layers don't stick together, so I tried from 260 - 300°