Sensorless X/Y homing and other Prusa MK3 features
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@fma:
Is this sensor accurate? I mean, can it be used to really measure the filament advance? Or is it just some 'order of magnitude'?
Prusa sayd that it actually is a Sensor like a Mouse so it should be work realy well.
Source: https://www.youtube.com/watch?v=mk1u5I5EKvQ -
Yes, I saw that. I would like to know what sensor he is using.
I made some tests, a few weeks ago, with an old mouse sensor (I found old stocks on ali express, with the lens), but it does not work on all filaments…
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I've preordered one so I can play I with the new features. I'm really excited about how much more reliable these sorts of additions will make 3D printing.
I'd be very interested in seeing support for the temperature compensated bed probe. I've been having horrible issues with fluctuations in readings with my inductive probe based on temperature.
I'm also desperate for someone to come out with custom-sized version of the magnetic spring steel bed, but that's a different topic entirely.
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Have you considered other probing options. Smarteffector or piezo probes are not affected by temperature in this way? If prusa are temperature compensating their pinda probe then it must be capacitative, these are not a great choice generally but if you have sufficient control of the entire machine as prusa do they can be made to work. I wonder if they have a humidity sensor too?
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Have you considered other probing options. Smarteffector or piezo probes are not affected by temperature in this way? If prusa are temperature compensating their pinda probe then it must be capacitative, these are not a great choice generally but if you have sufficient control of the entire machine as prusa do they can be made to work. I wonder if they have a humidity sensor too?
I'm 99% sure that Prusa is using inductive sensor like they have in the past. Previously they actually had specific locations on the PCB heater that were also used for calibration. I'm not sure how that will work with the new spring steel print bed.
I've thought about using a different type of sensor, but just haven't had the time to actually follow through on it.
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At TCT today I had a good look at the i3 mk2 and mk3, thinking about buying a mk3. We've been thinking about how to integrate our sensor on an i3. If you were willing to give it a try we'd happily give you one to play with. We were thinking it might be a waste of time given that the sensor on the i3 seems to be very much an integrated part of the machine, with the axis calibration/bed levelling etc.. and I have not heard many complaints from i3 owners so far, but if it is not performing to your expectations, then I am quite sure we can improve upon it. Piezo is just a more reliable way to do it and has the added benefits of no offsets, its independent of the surface being printed on, its light, and permanently mounted.
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Why did Prusa not install a BLTouch?
I orderd one and hope it will work better than my Capacitive Sensor.
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Bltouch is a nice idea but it's not that accurate or repeatable. I suspect it wasn't good enough for Prusa.
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The inductive sensor is used to detect probe points in the bed. Since the beds are precisely manufactured and their position is known, this data can be used to adjust for slanted bed/skewed axis. With a Bltouch or a piezo you'll still be able to do mesh bed leveling (probably to much better precision with the piezo), but no MK2 specific black magic calibration.
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Bltouch is a nice idea but it's not that accurate or repeatable. I suspect it wasn't good enough for Prusa.
Sry i never heard something from a Sensor like this.
Does it use the preasure when the Nozzle touches the Bed or use it some sort of light to measure the Distance? -
Bltouch is an all in one probe and solenoid to deploy/stow it. https://m.aliexpress.com/search.htm?keywords=bltouch#/ Its small and light and easy to mount. Just not very accurate, accurate enough for a reasonable first layer on a cartesian machine, but isn't going to calibrate your large delta that accurately.
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Sry i quoted the Wrong Post.
I wanna know something about the Piezo.
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link to it is in Dj's signature
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What he said. There's a ton of info there.
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It's really top of line! I swapped a DC42 IR sensor for piezo and I'm not looking back. This thing is accurate and works on any surface I've tested it on without having to redo offset. Swapping nozzles and even from regular to volcano without having to redo Z offset is awesome. Not going back
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After tct were looking into streamlining it and maybe getting them made in sls nylon, but this will be a while.
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The ideal motors for stall detection would be high-inductance ones - which is just the opposite of what you need for high speed.
Maybe I should put an experimental stall detect feature in 1.20, with configurable stallguard thresholds and minimum speeds at which it is used.
Yup yup yup, all over this as needing to be a feature added!
