I've been working on getting better prints out of my prusa mendel and everything seems fine but I can't seem to get the retraction to not leave a blob when it starts and stops. I'm running marlin, and I don't seem to see anything in the code that could conflict with the slic3r retraction settings. it does the same thing using pronterface or repetier host, when it tries to retract any amount i set it to, from .5 to 2mm the extruder only retracts about .5mm then moves back half of that and keeps printing. when printing many short pieces in a row, when it keeps retracting it slowly pulls out the filament and stops extruding until it does a long stretch again. using pronterface I can move the extruder fairly fast in both directions, so I know the motors work. I'm not sure what else to try now
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