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extruder: Avoid maximum extrude cross section errors on infinitesimal moves 

Be less likely to raise a "Move exceeds maximum extrusion cross
section" error on very short moves.  It's okay to extrude a little
extra plastic on moves shorter than the nozzle diameter.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-03-19 21:38:59 -04:00
parent 5ff2d5aee6
commit f97cf5c3b6
1 changed files with 6 additions and 4 deletions
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10
klippy/extruder.py
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@ -13,11 +13,11 @@ class PrinterExtruder:
self.config = config
self.heater = heater.PrinterHeater(printer, config)
self.stepper = stepper.PrinterStepper(printer, config, 'extruder')
nozzle_diameter = config.getfloat('nozzle_diameter')
self.nozzle_diameter = config.getfloat('nozzle_diameter')
filament_diameter = config.getfloat('filament_diameter')
filament_area = math.pi * (filament_diameter * .5)**2
max_cross_section = config.getfloat(
'max_extrude_cross_section', 4. * nozzle_diameter**2)
'max_extrude_cross_section', 4. * self.nozzle_diameter**2)
self.max_extrude_ratio = max_cross_section / filament_area
self.max_e_dist = config.getfloat('max_extrude_only_distance', 50.)
self.max_e_velocity = self.max_e_accel = None
@ -49,8 +49,10 @@ class PrinterExtruder:
raise homing.EndstopMoveError(
move.end_pos, "Extrude only move too long")
move.limit_speed(self.max_e_velocity, self.max_e_accel)
elif move.extrude_r > self.max_extrude_ratio:
logging.debug("%s vs %s" % (move.extrude_r, self.max_extrude_ratio))
elif (move.extrude_r > self.max_extrude_ratio
and move.axes_d[3] > self.nozzle_diameter*self.max_extrude_ratio):
logging.debug("Overextrude: %s vs %s" % (
move.extrude_r, self.max_extrude_ratio))
raise homing.EndstopMoveError(
move.end_pos, "Move exceeds maximum extrusion cross section")
def calc_junction(self, prev_move, move):