docs: Wrap BLTouch.md to 80 columns.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor
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docs/BLTouch.md
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docs/BLTouch.md
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Connecting BL-Touch
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===================
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A **warning** before you start: Avoid touching the BLTouch pin with your bare fingers, since it is
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quite sensitive to finger grease. And if you do touch it, be very gentle, in order to not bend or
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push anything.
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A **warning** before you start: Avoid touching the BLTouch pin with
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your bare fingers, since it is quite sensitive to finger grease. And
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if you do touch it, be very gentle, in order to not bend or push
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anything.
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Once you've hooked up the BL-Touch servo connector to a `control_pin` according to the BL-Touch
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documentation or of your MCU. Using the original wiring, the yellow wire from the triple is
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the `control_pin`, the white wire from the pair is the `sensor_pin`. You need to configure
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these pins according to your wiring with Klipper:
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Once you've hooked up the BL-Touch servo connector to a `control_pin`
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according to the BL-Touch documentation or of your MCU. Using the
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original wiring, the yellow wire from the triple is the `control_pin`,
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the white wire from the pair is the `sensor_pin`. You need to
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configure these pins according to your wiring with Klipper:
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```
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[bltouch]
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sensor_pin: P1.24
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# Pin connected to the BL-Touch sensor pin. This parameter must be
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# provided.
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control_pin: P1.26
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[bltouch]
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sensor_pin: P1.24
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# Pin connected to the BL-Touch sensor pin. This parameter must be
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# provided.
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control_pin: P1.26
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```
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You also most likely need to configure a homing override to first raise the z-axis, then home the x-
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and y-axis, and finally move to the center and home the z-axis. Like this:
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You also most likely need to configure a homing override to first
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raise the z-axis, then home the x- and y-axis, and finally move to the
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center and home the z-axis. Like this:
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```
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[homing_override]
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gcode:
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G1 Z10 ; Move up 10mm
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G28 X Y
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G1 X166 Y120 F6000 ; Change the X and Y coordinates to the center of your print bed
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G28 Z
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set_position_z: 0.0
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[homing_override]
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gcode:
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G1 Z10 ; Move up 10mm
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G28 X Y
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G1 X166 Y120 F6000 ; Change the X and Y coordinates to the center of your print bed
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G28 Z
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set_position_z: 0.0
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```
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It's important that the upwards movement is high enough, so that the probe or the nozzle don't hit
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any binder clips, even if the probe pin happens to be in it's lowest state.
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It's important that the upwards movement is high enough, so that the
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probe or the nozzle don't hit any binder clips, even if the probe pin
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happens to be in it's lowest state.
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Initial tests
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=============
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Before moving on, verify that the BLTouch is mounted at the correct height, the pin should be
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roughly 2 mm above the nozzle when retracted
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Before moving on, verify that the BLTouch is mounted at the correct
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height, the pin should be roughly 2 mm above the nozzle when retracted
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When you turn on the printer, the BLTouch probe should perform a self-test and move the pin up and
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down a couple of times. Once the self-test is completed, the pin should be retracted and the red LED
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on the probe should be lit. If there are any errors, for example the probe is flashing red or the
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pin is down instead of up, please turn off the printer and check the wiring and configuration.
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When you turn on the printer, the BLTouch probe should perform a
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self-test and move the pin up and down a couple of times. Once the
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self-test is completed, the pin should be retracted and the red LED on
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the probe should be lit. If there are any errors, for example the
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probe is flashing red or the pin is down instead of up, please turn
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off the printer and check the wiring and configuration.
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If the above is looking good, it's time to test that the probe responds to commands from the
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firmware. First run `BLTOUCH_DEBUG COMMAND=pin_down` in your printer terminal. Verify that the pin
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moves down, and that the red LED on the probe turns off. If not, check your wiring and configuration
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again. Next issue a `BLTOUCH_DEBUG COMMAND=pin_up` and verify that the pin moves up, and that the
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red light turns on again. If it's flashing then there's some problem.
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If the above is looking good, it's time to test that the probe
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responds to commands from the firmware. First run `BLTOUCH_DEBUG
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COMMAND=pin_down` in your printer terminal. Verify that the pin moves
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down, and that the red LED on the probe turns off. If not, check your
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wiring and configuration again. Next issue a `BLTOUCH_DEBUG
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COMMAND=pin_up` and verify that the pin moves up, and that the red
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light turns on again. If it's flashing then there's some problem.
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Now, it's time to test homing with a twist. Instead of letting the probe pin touch the print bed,
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let it touch the nail on your finger. So issue a `G28`, wait until it starts to move down, and stop
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the movement by very gently touching the pin with your nail. You probably have to do it twice, since
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the default configuration makes it probe twice. But be prepared to turn off the printer, to avoid
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damage, if it doesn't stop when you touch the pin.
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Now, it's time to test homing with a twist. Instead of letting the
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probe pin touch the print bed, let it touch the nail on your
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finger. So issue a `G28`, wait until it starts to move down, and stop
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the movement by very gently touching the pin with your nail. You
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probably have to do it twice, since the default configuration makes it
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probe twice. But be prepared to turn off the printer, to avoid damage,
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if it doesn't stop when you touch the pin.
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If that was successful, do another `G28` but this time let it touch the bed as it should.
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If that was successful, do another `G28` but this time let it touch
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the bed as it should.
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Calibrating the BL-Touch
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========================
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### X/Y Offset
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In order to make klipper work properly you need to tell it in which relation to the nozzle
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the probe is exactly located. Lets start with the `x_offset` and the `y_offset`
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In order to make klipper work properly you need to tell it in which
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relation to the nozzle the probe is exactly located. Lets start with
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the `x_offset` and the `y_offset`
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In order to find the proper vertical offset of the probe you need to know a certain point of
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your bed. X/Y = 0 may be a good point for this, any other will do as long as you know it.
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Find it by lowering the nozzle next to it using `g0 z0.5`. Create a removable mark on your
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In order to find the proper vertical offset of the probe you need to
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know a certain point of your bed. X/Y = 0 may be a good point for
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this, any other will do as long as you know it. Find it by lowering
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the nozzle next to it using `g0 z0.5`. Create a removable mark on your
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bed by i.e. using a non permanent marker.
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Now move the tip of the BL-Touch over that point by jogging there with the controls in the `control` tab of
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OctoPrint. Once the BL-Touch is roughly over the point acquire it using the `GET_POSITION` command.
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The difference to your marked point is your `x_offset` and `y_offset` to configure in the `printer.cfg`.
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Now move the tip of the BL-Touch over that point by jogging there with
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the controls in the `control` tab of OctoPrint. Once the BL-Touch is
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roughly over the point acquire it using the `GET_POSITION` command.
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The difference to your marked point is your `x_offset` and `y_offset`
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to configure in the `printer.cfg`.
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### Z Offset
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1. We start by changing the `z_offset` in the `bltouch` section of the configuration to 10. This
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setting is very wrong, but it will make it possible to move down to the right height using the
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menus. Run `RESTART` after changing it to reload the configuration.
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1. We start by changing the `z_offset` in the `bltouch` section of the
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configuration to 10. This setting is very wrong, but it will make it
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possible to move down to the right height using the menus. Run
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`RESTART` after changing it to reload the configuration.
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2. Now run `G28`, to home the printer. Take a note of the point where the pin hits the bed and use
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the menu to move the nozzle to that point. Now take a *folded* paper and put it under the nozzle.
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Move the nozzle down using the menu, in 0.1mm steps, until it grabs the paper. It doesn't matter how
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much it grabs, you are searching for the higest position that grabs the paper. The nozzle should now
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be between 0.1mm and 0.2mm above the printbed. If you wonder why we used a folded paper, the answer
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is that the granularity of the movement is only 0.1mm, or the same as a normal paper thickness, that
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means that you could easily move too far and hit the bed.
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2. Now run `G28`, to home the printer. Take a note of the point where
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the pin hits the bed and use the menu to move the nozzle to that
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point. Now take a *folded* paper and put it under the nozzle. Move
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the nozzle down using the menu, in 0.1mm steps, until it grabs the
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paper. It doesn't matter how much it grabs, you are searching for the
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higest position that grabs the paper. The nozzle should now be
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between 0.1mm and 0.2mm above the printbed. If you wonder why we used
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a folded paper, the answer is that the granularity of the movement is
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only 0.1mm, or the same as a normal paper thickness, that means that
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you could easily move too far and hit the bed.
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3. Now update the `z_offset` to reflect this, by substracting the current offset (10) by the reading
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on the printer display. So if it says 8.2, then `10-8.2` = 1.8
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3. Now update the `z_offset` to reflect this, by substracting the
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current offset (10) by the reading on the printer display. So if it
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says 8.2, then `10-8.2` = 1.8
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4. Restart the printer, issue a `G28`, move to the pin location, then `G1 Z0`, and verify that it's
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still grabbing the paper as it was before. If not, then repeat step 2. and 3. until you are
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satisfied.
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4. Restart the printer, issue a `G28`, move to the pin location, then
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`G1 Z0`, and verify that it's still grabbing the paper as it was
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before. If not, then repeat step 2. and 3. until you are satisfied.
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5. At this point it's a good idea to verify that the offset is close to 1mm, if not, then you
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probably want to move the probe up or down to fix this. You want it to trigger well before the
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nozzle hits the bed, so that possible stuck filament or a warped bed don't affect any probing
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action. But at the same time, you want that the retracted position is as far above the nozzle as
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possible, to avoid damage by touching printed parts.
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5. At this point it's a good idea to verify that the offset is close
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to 1mm, if not, then you probably want to move the probe up or down to
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fix this. You want it to trigger well before the nozzle hits the bed,
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so that possible stuck filament or a warped bed don't affect any
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probing action. But at the same time, you want that the retracted
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position is as far above the nozzle as possible, to avoid damage by
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touching printed parts.
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6. Now it's time to fine tune with a real print. First make sure that your flow rate and steps are
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calibrated properly, so that wrongly configured flow rates don't affect the calibration. Then slice
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a one layer thick object, located close to where you are homing. I recommend a simple 50x50 mm
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square.
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6. Now it's time to fine tune with a real print. First make sure that
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your flow rate and steps are calibrated properly, so that wrongly
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configured flow rates don't affect the calibration. Then slice a one
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layer thick object, located close to where you are homing. I recommend
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a simple 50x50 mm square.
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7. While the object is printing, use the tune menu to adjust the "Offset Z", until it looks good.
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With some practice, it's possible to find the exact point where it goes from underextrusion to
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overextrusion, but some filaments are harder to see than others. Also notice that the tune command
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does not have any effect immediately, it takes a couple of movements until the printer uses the new
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value. It might also be hard to see exactly what's happening while it's printing, so you can adjust
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for example every cm, and then find the best setting when the print is done.
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7. While the object is printing, use the tune menu to adjust the
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"Offset Z", until it looks good. With some practice, it's possible to
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find the exact point where it goes from underextrusion to
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overextrusion, but some filaments are harder to see than others. Also
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notice that the tune command does not have any effect immediately, it
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takes a couple of movements until the printer uses the new value. It
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might also be hard to see exactly what's happening while it's
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printing, so you can adjust for example every cm, and then find the
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best setting when the print is done.
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8. Update the `z_offset` configuration again by using subtraction. So if the display shows that you
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tuned the z-offset to -0.100, then it's calculated like this `1.8 -(-0.100) = 1.9`, notice the
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double minus sign.
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8. Update the `z_offset` configuration again by using subtraction. So
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if the display shows that you tuned the z-offset to -0.100, then it's
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calculated like this `1.8 -(-0.100) = 1.9`, notice the double minus
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sign.
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9. Issue a `RESTART`, and test printing the same thing, this time without adjusting anything.
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Perform steps 7-9 until you are happy.
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9. Issue a `RESTART`, and test printing the same thing, this time
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without adjusting anything. Perform steps 7-9 until you are happy.
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BL-Touch gone bad
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=================
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Once the BL-Touch is in inconsistent state, it starts blinking red. You can force it to leave that
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state by issuing:
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Once the BL-Touch is in inconsistent state, it starts blinking
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red. You can force it to leave that state by issuing:
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BLTOUCH_DEBUG COMMAND=reset
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This may happen if its calibration is interrupted by the probe being blocked from being extracted.
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This may happen if its calibration is interrupted by the probe being
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blocked from being extracted.
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However, the BL-Touch may also not be able to calibrate itself anymore. This happenes if the
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screw on its top is in the wrong position, or the magnetic core inside the probe pin has moved.
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If its moved that way up that it sticks to the screw, it may not be able to lower its pin anymore.
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With this behaviour you need to open the screw, pick i.e. a ball-pen and push it gently back in place.
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Re-Insert the pin into the BL-Touch so that it falls into extracted position. Carefully readjust the
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headless screw into place. You need to find the right position so it is able to lower and raise the
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pin, and the red light turns on and of. Use the `reset`, `pin_up` and `pin_down` commands to
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achieve this.
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However, the BL-Touch may also not be able to calibrate itself
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anymore. This happenes if the screw on its top is in the wrong
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position, or the magnetic core inside the probe pin has moved. If its
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moved that way up that it sticks to the screw, it may not be able to
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lower its pin anymore. With this behaviour you need to open the
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screw, pick i.e. a ball-pen and push it gently back in place.
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Re-Insert the pin into the BL-Touch so that it falls into extracted
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position. Carefully readjust the headless screw into place. You need
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to find the right position so it is able to lower and raise the pin,
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and the red light turns on and of. Use the `reset`, `pin_up` and
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`pin_down` commands to achieve this.
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