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extruder: Initial support for "smoothed pressure advance"

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Support averaging the extruder position over a time range to "smooth
out" the velocity changes that occur during pressure advance.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-11-05 16:21:06 -05:00
parent da06e185fb
commit 6d0c55b6c1
7 changed files with 108 additions and 175 deletions
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13
config/example.cfg
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@@ -130,13 +130,12 @@ filament_diameter: 3.500
# during deceleration. It is measured in millimeters per
# millimeter/second. The default is 0, which disables pressure
# advance.
#pressure_advance_lookahead_time: 0.010
# A time (in seconds) to "look ahead" at future extrusion moves when
# calculating pressure advance. This is used to reduce the
# application of pressure advance during cornering moves that would
# otherwise cause retraction followed immediately by pressure
# buildup. This setting only applies if pressure_advance is
# non-zero. The default is 0.010 (10 milliseconds).
#pressure_advance_smooth_time: 0.040
# A time range (in seconds) to use when calculating the average
# extruder velocity for pressure advance. A larger value results in
# smoother extruder movements. This parameter may not exceed 200ms.
# This setting only applies if pressure_advance is non-zero. The
# default is 0.040 (40 milliseconds).
#
# The remaining variables describe the extruder heater.
heater_pin: ar10