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extruder: Fix retract 

Commit 7554c7f6 broke retract moves.  Fix by making sure extrude_r is
always a positive number.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-12-01 17:37:13 -05:00
parent 00b40b720f
commit d2abbd8f5d
1 changed files with 1 additions and 1 deletions
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klippy/extruder.py
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@ -36,7 +36,7 @@ class PrinterExtruder:
self.stepper.motor_enable(move_time, 1)
self.need_motor_enable = False
axis_d = move.axes_d[3]
extrude_r = axis_d / move.move_d
extrude_r = abs(axis_d) / move.move_d
inv_accel = 1. / (move.accel * extrude_r)
start_v = move.start_v * extrude_r