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docs: Recommend safe_z_home over homing_override

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Update BLTouch.md, FAQ.md, and sample-probe-as-z-endstop.cfg to
recommend using a safe_z_home config section over a homing_override
config section.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-11-07 16:50:52 -05:00
parent ed610a6600
commit 3665e9fc53
3 changed files with 20 additions and 27 deletions
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24
docs/BLTouch.md
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@ -20,24 +20,20 @@ control_pin: P1.26
If the BL-Touch will be used to home the Z axis then set `endstop_pin:
probe:z_virtual_endstop` in the `[stepper_z]` config section and add a
`[homing_override]` config section to raise the z-axis, home the
x/y-axis, move to the center of the bed, and home the z-axis. For
example:
`[safe_z_home]` config section to raise the z axis, home the xy axes,
move to the center of the bed, and home the z axis. For example:
```
[homing_override]
gcode:
G90 ; Use absolute position mode
G1 Z10 ; Move up 10mm
G28 X Y
G1 X166 Y120 F6000 ; Change the X and Y coordinates to the center of your print bed
G28 Z
set_position_z: 0.0
[safe_z_home]
home_xy_position: 100,100 # Change coordinates to the center of your print bed
speed: 50
z_hop: 10 # Move up 10mm
z_hop_speed: 5
```
It's important that the initial Z upwards movement in the
homing_override is high enough that the probe doesn't hit anything
even if the probe pin happens to be in its lowest state.
It's important that the z_hop movement in safe_z_home is high enough
that the probe doesn't hit anything even if the probe pin happens to
be in its lowest state.
Initial tests
=============