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diff --git a/docs/BLTouch.md b/docs/BLTouch.md index 0ae500aa..cef8b671 100644 --- a/docs/BLTouch.md +++ b/docs/BLTouch.md @@ -1,143 +1,174 @@ Connecting BL-Touch =================== -A **warning** before you start: Avoid touching the BLTouch pin with your bare fingers, since it is -quite sensitive to finger grease. And if you do touch it, be very gentle, in order to not bend or -push anything. +A **warning** before you start: Avoid touching the BLTouch pin with +your bare fingers, since it is quite sensitive to finger grease. And +if you do touch it, be very gentle, in order to not bend or push +anything. -Once you've hooked up the BL-Touch servo connector to a `control_pin` according to the BL-Touch -documentation or of your MCU. Using the original wiring, the yellow wire from the triple is -the `control_pin`, the white wire from the pair is the `sensor_pin`. You need to configure -these pins according to your wiring with Klipper: +Once you've hooked up the BL-Touch servo connector to a `control_pin` +according to the BL-Touch documentation or of your MCU. Using the +original wiring, the yellow wire from the triple is the `control_pin`, +the white wire from the pair is the `sensor_pin`. You need to +configure these pins according to your wiring with Klipper: ``` - - [bltouch] - sensor_pin: P1.24 - # Pin connected to the BL-Touch sensor pin. This parameter must be - # provided. - control_pin: P1.26 +[bltouch] +sensor_pin: P1.24 +# Pin connected to the BL-Touch sensor pin. This parameter must be +# provided. +control_pin: P1.26 ``` -You also most likely need to configure a homing override to first raise the z-axis, then home the x- -and y-axis, and finally move to the center and home the z-axis. Like this: +You also most likely need to configure a homing override to first +raise the z-axis, then home the x- and y-axis, and finally move to the +center and home the z-axis. Like this: ``` - [homing_override] - gcode: - 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 +[homing_override] +gcode: + 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 ``` -It's important that the upwards movement is high enough, so that the probe or the nozzle don't hit -any binder clips, even if the probe pin happens to be in it's lowest state. +It's important that the upwards movement is high enough, so that the +probe or the nozzle don't hit any binder clips, even if the probe pin +happens to be in it's lowest state. Initial tests ============= -Before moving on, verify that the BLTouch is mounted at the correct height, the pin should be -roughly 2 mm above the nozzle when retracted +Before moving on, verify that the BLTouch is mounted at the correct +height, the pin should be roughly 2 mm above the nozzle when retracted -When you turn on the printer, the BLTouch probe should perform a self-test and move the pin up and -down a couple of times. Once the self-test is completed, the pin should be retracted and the red LED -on the probe should be lit. If there are any errors, for example the probe is flashing red or the -pin is down instead of up, please turn off the printer and check the wiring and configuration. +When you turn on the printer, the BLTouch probe should perform a +self-test and move the pin up and down a couple of times. Once the +self-test is completed, the pin should be retracted and the red LED on +the probe should be lit. If there are any errors, for example the +probe is flashing red or the pin is down instead of up, please turn +off the printer and check the wiring and configuration. -If the above is looking good, it's time to test that the probe responds to commands from the -firmware. First run `BLTOUCH_DEBUG COMMAND=pin_down` in your printer terminal. Verify that the pin -moves down, and that the red LED on the probe turns off. If not, check your wiring and configuration -again. Next issue a `BLTOUCH_DEBUG COMMAND=pin_up` and verify that the pin moves up, and that the -red light turns on again. If it's flashing then there's some problem. +If the above is looking good, it's time to test that the probe +responds to commands from the firmware. First run `BLTOUCH_DEBUG +COMMAND=pin_down` in your printer terminal. Verify that the pin moves +down, and that the red LED on the probe turns off. If not, check your +wiring and configuration again. Next issue a `BLTOUCH_DEBUG +COMMAND=pin_up` and verify that the pin moves up, and that the red +light turns on again. If it's flashing then there's some problem. -Now, it's time to test homing with a twist. Instead of letting the probe pin touch the print bed, -let it touch the nail on your finger. So issue a `G28`, wait until it starts to move down, and stop -the movement by very gently touching the pin with your nail. You probably have to do it twice, since -the default configuration makes it probe twice. But be prepared to turn off the printer, to avoid -damage, if it doesn't stop when you touch the pin. +Now, it's time to test homing with a twist. Instead of letting the +probe pin touch the print bed, let it touch the nail on your +finger. So issue a `G28`, wait until it starts to move down, and stop +the movement by very gently touching the pin with your nail. You +probably have to do it twice, since the default configuration makes it +probe twice. But be prepared to turn off the printer, to avoid damage, +if it doesn't stop when you touch the pin. -If that was successful, do another `G28` but this time let it touch the bed as it should. +If that was successful, do another `G28` but this time let it touch +the bed as it should. Calibrating the BL-Touch ======================== ### X/Y Offset -In order to make klipper work properly you need to tell it in which relation to the nozzle -the probe is exactly located. Lets start with the `x_offset` and the `y_offset` +In order to make klipper work properly you need to tell it in which +relation to the nozzle the probe is exactly located. Lets start with +the `x_offset` and the `y_offset` -In order to find the proper vertical offset of the probe you need to know a certain point of -your bed. X/Y = 0 may be a good point for this, any other will do as long as you know it. -Find it by lowering the nozzle next to it using `g0 z0.5`. Create a removable mark on your +In order to find the proper vertical offset of the probe you need to +know a certain point of your bed. X/Y = 0 may be a good point for +this, any other will do as long as you know it. Find it by lowering +the nozzle next to it using `g0 z0.5`. Create a removable mark on your bed by i.e. using a non permanent marker. -Now move the tip of the BL-Touch over that point by jogging there with the controls in the `control` tab of -OctoPrint. Once the BL-Touch is roughly over the point acquire it using the `GET_POSITION` command. -The difference to your marked point is your `x_offset` and `y_offset` to configure in the `printer.cfg`. +Now move the tip of the BL-Touch over that point by jogging there with +the controls in the `control` tab of OctoPrint. Once the BL-Touch is +roughly over the point acquire it using the `GET_POSITION` command. +The difference to your marked point is your `x_offset` and `y_offset` +to configure in the `printer.cfg`. ### Z Offset -1. We start by changing the `z_offset` in the `bltouch` section of the configuration to 10. This -setting is very wrong, but it will make it possible to move down to the right height using the -menus. Run `RESTART` after changing it to reload the configuration. +1. We start by changing the `z_offset` in the `bltouch` section of the +configuration to 10. This setting is very wrong, but it will make it +possible to move down to the right height using the menus. Run +`RESTART` after changing it to reload the configuration. -2. Now run `G28`, to home the printer. Take a note of the point where the pin hits the bed and use -the menu to move the nozzle to that point. Now take a *folded* paper and put it under the nozzle. -Move the nozzle down using the menu, in 0.1mm steps, until it grabs the paper. It doesn't matter how -much it grabs, you are searching for the higest position that grabs the paper. The nozzle should now -be between 0.1mm and 0.2mm above the printbed. If you wonder why we used a folded paper, the answer -is that the granularity of the movement is only 0.1mm, or the same as a normal paper thickness, that -means that you could easily move too far and hit the bed. +2. Now run `G28`, to home the printer. Take a note of the point where +the pin hits the bed and use the menu to move the nozzle to that +point. Now take a *folded* paper and put it under the nozzle. Move +the nozzle down using the menu, in 0.1mm steps, until it grabs the +paper. It doesn't matter how much it grabs, you are searching for the +higest position that grabs the paper. The nozzle should now be +between 0.1mm and 0.2mm above the printbed. If you wonder why we used +a folded paper, the answer is that the granularity of the movement is +only 0.1mm, or the same as a normal paper thickness, that means that +you could easily move too far and hit the bed. -3. Now update the `z_offset` to reflect this, by substracting the current offset (10) by the reading -on the printer display. So if it says 8.2, then `10-8.2` = 1.8 +3. Now update the `z_offset` to reflect this, by substracting the +current offset (10) by the reading on the printer display. So if it +says 8.2, then `10-8.2` = 1.8 -4. Restart the printer, issue a `G28`, move to the pin location, then `G1 Z0`, and verify that it's -still grabbing the paper as it was before. If not, then repeat step 2. and 3. until you are -satisfied. +4. Restart the printer, issue a `G28`, move to the pin location, then +`G1 Z0`, and verify that it's still grabbing the paper as it was +before. If not, then repeat step 2. and 3. until you are satisfied. -5. At this point it's a good idea to verify that the offset is close to 1mm, if not, then you -probably want to move the probe up or down to fix this. You want it to trigger well before the -nozzle hits the bed, so that possible stuck filament or a warped bed don't affect any probing -action. But at the same time, you want that the retracted position is as far above the nozzle as -possible, to avoid damage by touching printed parts. +5. At this point it's a good idea to verify that the offset is close +to 1mm, if not, then you probably want to move the probe up or down to +fix this. You want it to trigger well before the nozzle hits the bed, +so that possible stuck filament or a warped bed don't affect any +probing action. But at the same time, you want that the retracted +position is as far above the nozzle as possible, to avoid damage by +touching printed parts. -6. Now it's time to fine tune with a real print. First make sure that your flow rate and steps are -calibrated properly, so that wrongly configured flow rates don't affect the calibration. Then slice -a one layer thick object, located close to where you are homing. I recommend a simple 50x50 mm -square. +6. Now it's time to fine tune with a real print. First make sure that +your flow rate and steps are calibrated properly, so that wrongly +configured flow rates don't affect the calibration. Then slice a one +layer thick object, located close to where you are homing. I recommend +a simple 50x50 mm square. -7. While the object is printing, use the tune menu to adjust the "Offset Z", until it looks good. -With some practice, it's possible to find the exact point where it goes from underextrusion to -overextrusion, but some filaments are harder to see than others. Also notice that the tune command -does not have any effect immediately, it takes a couple of movements until the printer uses the new -value. It might also be hard to see exactly what's happening while it's printing, so you can adjust -for example every cm, and then find the best setting when the print is done. +7. While the object is printing, use the tune menu to adjust the +"Offset Z", until it looks good. With some practice, it's possible to +find the exact point where it goes from underextrusion to +overextrusion, but some filaments are harder to see than others. Also +notice that the tune command does not have any effect immediately, it +takes a couple of movements until the printer uses the new value. It +might also be hard to see exactly what's happening while it's +printing, so you can adjust for example every cm, and then find the +best setting when the print is done. -8. Update the `z_offset` configuration again by using subtraction. So if the display shows that you -tuned the z-offset to -0.100, then it's calculated like this `1.8 -(-0.100) = 1.9`, notice the -double minus sign. +8. Update the `z_offset` configuration again by using subtraction. So +if the display shows that you tuned the z-offset to -0.100, then it's +calculated like this `1.8 -(-0.100) = 1.9`, notice the double minus +sign. -9. Issue a `RESTART`, and test printing the same thing, this time without adjusting anything. -Perform steps 7-9 until you are happy. +9. Issue a `RESTART`, and test printing the same thing, this time +without adjusting anything. Perform steps 7-9 until you are happy. BL-Touch gone bad ================= -Once the BL-Touch is in inconsistent state, it starts blinking red. You can force it to leave that -state by issuing: + +Once the BL-Touch is in inconsistent state, it starts blinking +red. You can force it to leave that state by issuing: BLTOUCH_DEBUG COMMAND=reset -This may happen if its calibration is interrupted by the probe being blocked from being extracted. +This may happen if its calibration is interrupted by the probe being +blocked from being extracted. -However, the BL-Touch may also not be able to calibrate itself anymore. This happenes if the -screw on its top is in the wrong position, or the magnetic core inside the probe pin has moved. -If its moved that way up that it sticks to the screw, it may not be able to lower its pin anymore. -With this behaviour you need to open the screw, pick i.e. a ball-pen and push it gently back in place. -Re-Insert the pin into the BL-Touch so that it falls into extracted position. Carefully readjust the -headless screw into place. You need to find the right position so it is able to lower and raise the -pin, and the red light turns on and of. Use the `reset`, `pin_up` and `pin_down` commands to -achieve this. +However, the BL-Touch may also not be able to calibrate itself +anymore. This happenes if the screw on its top is in the wrong +position, or the magnetic core inside the probe pin has moved. If its +moved that way up that it sticks to the screw, it may not be able to +lower its pin anymore. With this behaviour you need to open the +screw, pick i.e. a ball-pen and push it gently back in place. +Re-Insert the pin into the BL-Touch so that it falls into extracted +position. Carefully readjust the headless screw into place. You need +to find the right position so it is able to lower and raise the pin, +and the red light turns on and of. Use the `reset`, `pin_up` and +`pin_down` commands to achieve this. |