... i'm printing with PLA in sprinter/printrun and had the same blobs when my extra distance after retract was set to big.
With proper adjustment (last settings: retract =5mm, extra distance =2mm) i eliminiated the blobs, but this is highly depending on nozzle diameter, printing speed (or applied pressure) and viscosity of the material.
Actually i've tightened the nozzle diameter and changed the material, so i have to adjust the parameters anew ... in the last print i had some 'blobbing' again, but not clearly defined, so ia have to adjust the printing speed in order to get better results.
Viktor
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