docs: Update BLTouch.md to refer to Probe_Calibrate.md for offset config
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor
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@ -71,85 +71,20 @@ 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
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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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Calibrating the BL-Touch offsets
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================================
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### X/Y Offset
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Follow the directions in the [Probe Calibrate](Probe_Calibrate.md)
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guide to set the x_offset, y_offset, and z_offset config parameters.
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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
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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
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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
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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
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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
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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
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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
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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 doesn'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
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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
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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
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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
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without adjusting anything. Perform steps 7-9 until you are happy.
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It's a good idea to verify that the Z offset is close to 1mm. If not,
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then you probably want to move the probe up or down to fix this. You
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want it to trigger well before the nozzle hits the bed, so that
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possible stuck filament or a warped bed doesn't affect any probing
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action. But at the same time, you want the retracted position to be as
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far above the nozzle as possible to avoid it touching printed parts.
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If an adjustment is made to the probe position, then rerun the probe
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calibration steps.
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BL-Touch gone bad
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=================
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