I have a suspicion that the torque required on the outer edges of the delta is higher than when printing in the middle. Have you calibrated the stepper drivers? My stepper drivers were at .65+v. I calibrated all of them to .42v if I recall correctly. This gives me a bit over 1 amp if im not mistaken. Also are you having any mechanical binding? I print ABS at 225c-230c depending on my speeds. Currently doing about 30mm/s Going to step it up soon as the print quality has been really good so far, however I need a geared extruder for this, which I am also designing.
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