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extruder: Add support for "pressure advance" on extrusion

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Add a config option to define an amount of additional filament to feed
into the extruder during acceleration and deceleration of the
extruder.  This can help ensure plastic is deposited in the correct
places during a print.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-07-16 19:58:41 -04:00
parent c847606311
commit dc37a07a8e
3 changed files with 109 additions and 39 deletions
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5
config/example.cfg
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@ -90,6 +90,11 @@ step_distance: .004242
max_velocity: 200000
max_accel: 3000
# The remaining variables describe the extruder heater
pressure_advance: 0.0
# The amount of raw filament to push into the extruder during
# extruder acceleration. An equal amount of filament is retracted
# during deceleration. It is measured in millimeters per
# millimeter/second
heater_pin: ar4
# PWM output pin controlling the heater
thermistor_pin: analog1