toolhead: Replace junction_deviation with square_corner_velocity

The junction_deviation configuration parameter has a number of quirks
that make it difficult to configure.  Replace it with a
"square_corner_velocity" configuration parameter.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 10 insertions, 5 deletions

diff --git a/config/example.cfg b/config/example.cfg
index cf02bf19..d8ca95fa 100644
--- a/config/example.cfg
+++ b/config/example.cfg
@@ -296,11 +296,16 @@ max_z_accel: 30
 #motor_off_time: 600
 #   Time (in seconds) of idle time before the printer will try to
 #   disable active motors. The default is 600 seconds.
-#junction_deviation: 0.02
-#   Distance (in mm) used to control the internal approximated
-#   centripetal velocity cornering algorithm. A larger number will
-#   permit higher "cornering speeds" at the junction of two moves. The
-#   default is 0.02mm.
+#square_corner_velocity: 5.0
+#   The maximum velocity (in mm/s) that the toolhead may travel a 90
+#   degree corner at. A non-zero value can reduce changes in extruder
+#   flow rates by enabling instantaneous velocity changes of the
+#   toolhead during cornering. This value configures the internal
+#   centripetal velocity cornering algorithm; corners with angles
+#   larger than 90 degrees will have a higher cornering velocity while
+#   corners with angles less than 90 degrees will have a lower
+#   cornering velocity. If this is set to zero then the toolhead will
+#   decelerate to zero at each corner. The default is 5mm/s.
 
 
 # Looking for more options? Check the example-extras.cfg file.