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screws_tilt_adjust: Add MAX_DEVIATION parameter for bed level invariant. 

This is useful when a saved bed mesh is used to ensure that the bed level
has not drifted too far from where it was when the mesh was created.

Signed-off-by: Johannes Stuettgen <johannes.stuettgen@gmail.com>
This commit is contained in:
Johannes Stuettgen 2021-02-08 17:52:46 +01:00 committed by KevinOConnor
parent d36dbfebd1
commit ed6ab6b9cc
3 changed files with 16 additions and 0 deletions
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7
docs/Manual_Level.md
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@ -191,3 +191,10 @@ it has an X or Y offset) then note that adjusting the bed tilt will
invalidate any previous probe calibration that was performed with a invalidate any previous probe calibration that was performed with a
tilted bed. Be sure to run [probe calibration](Probe_Calibrate.md) tilted bed. Be sure to run [probe calibration](Probe_Calibrate.md)
after the bed screws have been adjusted. after the bed screws have been adjusted.
The `MAX_DEVIATION` parameter is useful when a saved bed mesh is used,
to ensure that the bed level has not drifted too far from where it was when
the mesh was created. For example, `SCREWS_TILT_CALCULATE MAX_DEVIATION=0.01`
can be added to the custom start gcode of the slicer before the mesh is loaded.
It will abort the print if the configured limit is exceeded (0.01mm in this
example), giving the user a chance to adjust the screws and restart the print.

8
klippy/extras/screws_tilt_adjust.py
View File

@ -19,6 +19,7 @@ class ScrewsTiltAdjust:
self.config = config self.config = config
self.printer = config.get_printer() self.printer = config.get_printer()
self.screws = [] self.screws = []
self.max_diff = None
# Read config # Read config
for i in range(99): for i in range(99):
prefix = "screw%d" % (i + 1,) prefix = "screw%d" % (i + 1,)
@ -51,11 +52,13 @@ class ScrewsTiltAdjust:
"of turns to level it." "of turns to level it."
def cmd_SCREWS_TILT_CALCULATE(self, gcmd): def cmd_SCREWS_TILT_CALCULATE(self, gcmd):
self.max_diff = gcmd.get_float("MAX_DEVIATION", None)
self.probe_helper.start_probe(gcmd) self.probe_helper.start_probe(gcmd)
def probe_finalize(self, offsets, positions): def probe_finalize(self, offsets, positions):
# Factors used for CW-M3, CCW-M3, CW-M4, CCW-M4, CW-M5 and CCW-M5 # Factors used for CW-M3, CCW-M3, CW-M4, CCW-M4, CW-M5 and CCW-M5
threads_factor = {0: 0.5, 1: 0.5, 2: 0.7, 3: 0.7, 4: 0.8, 5: 0.8} threads_factor = {0: 0.5, 1: 0.5, 2: 0.7, 3: 0.7, 4: 0.8, 5: 0.8}
screw_diff = []
# Process the read Z values and # Process the read Z values and
for i, screw in enumerate(self.screws): for i, screw in enumerate(self.screws):
if i == 0: if i == 0:
@ -71,6 +74,7 @@ class ScrewsTiltAdjust:
z = positions[i][2] z = positions[i][2]
coord, name = screw coord, name = screw
diff = z_base - z diff = z_base - z
screw_diff.append(abs(diff))
if abs(diff) < 0.001: if abs(diff) < 0.001:
adjust = 0 adjust = 0
else: else:
@ -87,6 +91,10 @@ class ScrewsTiltAdjust:
"Adjust -> %s %02d:%02d" % "Adjust -> %s %02d:%02d" %
(name, coord[0], coord[1], z, sign, (name, coord[0], coord[1], z, sign,
abs(full_turns), abs(minutes))) abs(full_turns), abs(minutes)))
if self.max_diff and any((d > self.max_diff) for d in screw_diff):
raise self.gcode.error(
"bed level exceeds configured limits ({}mm)! " \
"Adjust screws and restart print.".format(self.max_diff))
def load_config(config): def load_config(config):
return ScrewsTiltAdjust(config) return ScrewsTiltAdjust(config)

1
test/klippy/screws_tilt_adjust.test
View File

@ -5,3 +5,4 @@ DICTIONARY atmega2560.dict
# Simple script to test # Simple script to test
G28 G28
SCREWS_TILT_CALCULATE SCREWS_TILT_CALCULATE
SCREWS_TILT_CALCULATE MAX_DEVIATION=0.01