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bed_mesh: enable relative offset bed meshes (#1323)

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Adds parameter for bed meshes to be adjusted relative to a probed point
during calibration. This allows the probe z offset to be ignored for
probes that are not stable over time (for example, the thermal drift of
inductive probes). An endstop other than the probe is then necessary to
determine the bed-nozzle offset.

Signed-off-by: Matt Baker <baker.matt.j@gmail.com>
This commit is contained in:
Matt Baker
2019-03-21 07:39:22 -07:00
committed by KevinOConnor
parent 6f91574cd9
commit f2fbe98454
2 changed files with 21 additions and 2 deletions
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19
klippy/extras/bed_mesh.py
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@@ -186,6 +186,7 @@ class BedMeshCalibrate:
self.printer = config.get_printer()
self.name = config.get_name()
self.radius = None
self.relative_reference_index = None
self.bedmesh = bedmesh
self.probed_z_table = None
self.build_map = False
@@ -267,8 +268,17 @@ class BedMeshCalibrate:
points.append((pos_x, pos_y))
pos_y += y_dist
logging.info('bed_mesh: generated points')
for p in points:
logging.info("(%.1f, %.1f)" % (p[0], p[1]))
for i, p in enumerate(points):
logging.info("%d: (%.1f, %.1f)" % (i, p[0], p[1]))
rref_index = config.get('relative_reference_index', None)
if rref_index is not None:
rref_index = int(rref_index)
if rref_index < 0 or rref_index >= len(points):
raise config.error("bed_mesh: relative reference index %d "
"is out of bounds" % (rref_index))
logging.info("bed_mesh: relative_reference_index %d is (%.2f, %.2f)"
% (rref_index, points[rref_index][0], points[rref_index][1]))
self.relative_reference_index = rref_index
return points
def _init_probe_params(self, config, points):
self.probe_params['min_x'] = min(points, key=lambda p: p[0])[0]
@@ -411,6 +421,11 @@ class BedMeshCalibrate:
x_cnt = self.probe_params['x_count']
y_cnt = self.probe_params['y_count']
if self.relative_reference_index is not None:
# zero out probe z offset and
# set offset relative to reference index
z_offset = positions[self.relative_reference_index][2]
self.probed_z_table = []
row = []
prev_pos = positions[0]