Duet WiFi firmware new feature priorities
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Yes, thank you. My plan, because I intend to use piezo force sensors under the bed, rather than a proximity sensor on the nozzle, actually is to "smash the nozzle into the bed." Hopefully that's not a problem – I think other people in this forum are using the piezo technique in some form?
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Yes, thank you. My plan, because I intend to use piezo force sensors under the bed, rather than a proximity sensor on the nozzle, actually is to "smash the nozzle into the bed." Hopefully that's not a problem – I think other people in this forum are using the piezo technique in some form?
Yes, so in your case, the nozzle is the probe (effectively) so altering it's length should not affect anything. Of course, try to "smash it" gently into the bed :). You'll likely find that that there will still be a slight trigger distance - maybe 0.1 mm or so because the Piezos will need to flex a bit, but as the sensors will be under the bed it will be independent of nozzle length and should remain constant. If the Piezos under the bed do not work out for you, then fitting the Piezo above the hot end should also allow you to change nozzles without having to reset the trigger height.
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Ian, that is a really good explanation of how probing works. Thanks!
Flattery? Stop it Tony, you'll make me blush:)
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Sounds good. I was worried that bed mapping or z stop detection wouldn't work for large changes. For example, I thought maybe a bed grid was generally used to map sub-millimeter differences, and that if you changed the nozzle length by 1cm, it might not figure out what was going on without manually changing settings.
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Two points:
1. Force sensors in the bed supports can suffer from the trigger height varying slightly with position. Typically they are more sensitive when you probe close to one of the sensors.
2. If you are going to change your nozzle length by a large amount on a delta printer without resetting the homed height parameter in the M665 command, you had better specify a large dive height in the M558 command.
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@dc42: I (unfortunately) assumed as much about the piezos. I don't want to usurp this thread, so I'm going to start a new one about piezo force sensing under the bed. Thanks for the input!
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I have started a new thread at https://forum.duet3d.com/topic/938/firmware-wishlist-and-priorities-for-duet-wifi-and-duet-ethernet/ to discuss firmware priorities, so I will lock this one.
