set plunger to 'bottom' during pick-up-tip to avoid firmware bug #245
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A user discovered a new bug, where given a special combination of coordinates, the AB motors squeal again during
pipette._position_for_aspirate()where the plunger is set tobottomposition.This patch sets the plunger to
bottomposition duringpipette.pick_up_tip()to avoid this moment all together. However, the long-term solution will be to switch to a newer build of smoothieware EDGE that fixes this bug.This issue has not been reported by any other user.