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docs: Note how to handle odd corner in Pressure_Advance.md 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2017-05-25 13:38:34 -04:00
parent 4b8ad3fc03
commit f91a49c65d
1 changed files with 13 additions and 5 deletions
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18
docs/Pressure_Advance.md
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@ -47,11 +47,13 @@ object. (Be sure to issue RESTART between each config change.) The
goal is to attempt to eliminate the blobbing during cornering. (With goal is to attempt to eliminate the blobbing during cornering. (With
pressure advance, the extruder will retract when the head slows down, pressure advance, the extruder will retract when the head slows down,
thus countering the pressure buildup and ideally eliminate the thus countering the pressure buildup and ideally eliminate the
blobbing.) If a test run is done with a pressure_advance setting that blobbing.)
is too high, one typically sees a dimple in the corner followed by
possible blobbing after the corner (too much filament is retracted If a test run is done with a pressure_advance setting that is too
during slow down and then too much filament is extruded during the high, one typically sees a dimple in the corner followed by possible
following speed up after cornering): blobbing after the corner (too much filament is retracted during slow
down and then too much filament is extruded during the following speed
up after cornering):
![corner-dimple](img/corner-dimple.jpg) ![corner-dimple](img/corner-dimple.jpg)
@ -63,6 +65,12 @@ in good quality corners:
Typical pressure_advance values are between 0.05 and 0.20 (the high Typical pressure_advance values are between 0.05 and 0.20 (the high
end usually only with bowden extruders). end usually only with bowden extruders).
It is not unusual for one corner of the test print to be consistently
different than the other three corners. This typically occurs when the
slicer arranges to always change Z height at that corner. If this
occurs, then ignore that corner and tune pressure_advance using the
other three corners.
Once a good pressure_advance value is found, return Once a good pressure_advance value is found, return
pressure_advance_lookahead_time to its default (0.010). This parameter pressure_advance_lookahead_time to its default (0.010). This parameter
controls how far in advance to check if a head slow-down is controls how far in advance to check if a head slow-down is