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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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16
docs/Pressure_Advance.md
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@ -22,12 +22,11 @@ Use a slicer to generate g-code for the large hollow square found in
speed (eg, 100mm/s), zero infill, and a coarse layer height (the layer
height should be around 75% of the nozzle diameter).
Prepare for the test by issuing the following G-Code commands:
Prepare for the test by issuing the following G-Code command:
```
SET_VELOCITY_LIMIT SQUARE_CORNER_VELOCITY=1 ACCEL=500
SET_PRESSURE_ADVANCE ADVANCE_LOOKAHEAD_TIME=0
```
These commands make the nozzle travel slower through corners and they
This command makes the nozzle travel slower through corners to
emphasize the effects of extruder pressure. Then for printers with a
direct drive extruder run the command:
```
@ -118,17 +117,6 @@ Important Notes
enough torque to push the required filament. If this occurs, either
use a lower acceleration value or disable pressure advance.
* The pressure_advance_lookahead_time parameter controls how far in
advance to check if a head slow-down is immediately followed by a
speed-up - it reduces pointless pressure changes in the head. It is
recommended to follow the steps above so that it is set to zero
during tuning and to use the default (0.010) during normal prints.
It is possible to tune this setting - higher values will reduce the
amount of pressure change in the nozzle during cornering, but
setting it too high can cause blobbing during cornering. (Tuning
this value is unlikely to impact ooze.) The default of 10ms should
work well on most printers.
* Once pressure advance is tuned in Klipper, it may still be useful to
configure a small retract value in the slicer (eg, 0.75mm) and to
utilize the slicer's "wipe on retract option" if available. These